Frequently Asked Questions


Q:  The MIDI Solutions products don't have a power input - do they require batteries?

A:  MIDI Solutions products are powered through the MIDI cable - no batteries or wall adapters are required to operate with most MIDI products! Please read the FAQs below for exceptions.


Q:  How do I set up the products for the function I need if they don't have any buttons or switches on them?

A:  MIDI Solutions products are programmed by sending them MIDI System Exclusive messages from a computer with a MIDI interface. The computer and MIDI interface is only required to program the products, once the MIDI Solutions products have been programmed they retain their settings and can be inserted wherever required in your MIDI setup. The Roland UM-ONE, Roland UM-ONE mk2, and Yamaha UX16 are low cost USB MIDI interfaces that can be used for this purpose. Avoid the MIDI interfaces on this list which have been reported not to provide power to the MIDI Solutions products. Also be cautious of bargain MIDI interfaces which may be unable to send complete MIDI System Exclusive messages. If you are unsure whether your MIDI interface is sending the complete programming messages then connect your MIDI interface's MIDI output directly back to its MIDI input, and view the MIDI data in SendSX for Windows, or MIDI Monitor for the Mac.

The MIDI Solutions Programming Tools software makes the programming process easy. The software creates the System Exclusive programming commands automatically as settings are selected from drop-down menus. The software is available free for download even if you haven't yet purchased a MIDI Solutions product, it's quick to install and simple to navigate - spending a few minutes with it is an excellent way to familiarize yourself with the products.

If you would rather not program the product yourself we can preprogram it to your specification for a $20 fee (please allow an additional week for delivery of preprogrammed products). However since programming the MIDI Solutions products is very easy we always suggest to customers to purchase a USB MIDI interface to program the products themselves if possible - a low cost MIDI USB interface can be purchased for around $40 USD, and if you ever decide you would like to change the settings you have the means to do so at your disposal. You may also find that the MIDI interface comes in handy for the odd MIDI task from time to time.


Q:  Is it necessary to program the MIDI Solutions products each time they are powered up?

A:  MIDI Solutions products retain their settings even after they are powered down, so programming only needs to be done only once to initialize them, or to change the settings.


Q:  Is it possible to combine multiple MIDI Solutions products for more functionality?

A:  MIDI Solutions products can be chained together in a modular fashion to provide exactly the functionality that is needed. Up to four MIDI Solutions products (except for the MIDI Solutions T8) can be powered from a single MIDI Out or Thru. If more products are required, the Power Adapter can be used to power up to 20 MIDI Solutions products.


Q:  Do MIDI Solutions products introduce any noticeable delay?

A:  MIDI Solutions Processors use fast processing algorithms to ensure that received data is processed and transmitted byte by byte whenever possible. This means that transmission of outgoing data bytes is started even before all bytes of an incoming MIDI message have been received, resulting in very small latencies. The MIDI Solutions Thru boxes and Power Adapter process MIDI data bit by bit, resulting in even smaller latencies.

There are only two circumstances in which MIDI data can be delayed longer. The first is when MIDI messages arrive at both inputs of a merger at exactly the same moment, one of the messages must be buffered to allow the other to pass through (this of course is a limitation of MIDI, not of the merger). The second is if an outgoing result depends on the value of the following byte. For example, if a MIDI Solutions product is programmed to filter all messages above a specific value then the third byte of the message (which specifies the value) must be received before the MIDI Solutions product can determine whether or not the message should be transmitted, adding 0.64 ms to the delay. These additional delays of milliseconds or fractions of milliseconds result in latencies that are still extremely small, much smaller than it is possible to hear.

The default settings for the programmable MIDI Solutions products are to pass all MIDI data unchanged allowing MIDI messages to be sent byte by byte, with a typical delay of 0.5 ms. By comparison it is estimated that the shortest time difference distinguishable by humans is approximately 10 ms, so even with up to 20 MIDI Solutions products chained in series the delay should not be noticeable. To put it in perspective the typical delay is equivalent to the time it takes sound to travel approximately six inches through air, so more delay is introduced by leaning forward or backward while playing than by inserting a MIDI Solutions product inline in the MIDI data stream.


Q:  Will inserting MIDI Solutions products in my setup cause ground loops?

A:  According to the MIDI specification, every MIDI connection must be optically isolated in order to avoid ground loops. Without optical isolation, a MIDI cable can create a ground loop by making an additional connection between devices that are already grounded together via a wall outlet. In order to obtain power from a MIDI Out or Thru, MIDI Solutions products do not contain an optoisolator at their MIDI inputs, however neither are they connected to a wall outlet for power, so no ground loop is created thus far. Subsequently the MIDI output of the MIDI Solutions product is connected to a MIDI input that does contain an optoisolator, so a ground loop is never created between any two devices by inserting a MIDI Solutions product inline. A MIDI Solutions product is essentially just an extension of the circuitry of the sending MIDI device it is connected to. MIDI Solutions products with more than a single MIDI input, i.e. MIDI Solutions Mergers, do have optoisolators at the additional inputs, again preventing the possibility of ground loops.

Since the MIDI Solutions products act as an extension of the circuitry of the sending device, when sending longer distances it is best to use a short cable from the sending device to the MIDI input of the MIDI Solutions product, and a long cable from the MIDI Solutions product to the receiving device with an optocoupled input (rather than a long cable from the sending device to the MIDI input of the MIDI Solutions product, and a short cable from the MIDI Solutions product to the receiving device). When making connections to the MIDI Solutions mergers, the short cable should go to the first input, and the longer cables to the other optocoupled inputs.


Q:  Is it possible to use a MIDI Solutions product as a stand-alone device without any devices connected to its MIDI input?

A:  MIDI Solutions products are powered from the device connected to their MIDI input, so even if you don't need to send MIDI messages into them they must still be connected to a MIDI output or Thru to receive power. Most MIDI Solutions products have an echo parameter, so if you don't want the MIDI messages received by the product to be passed through it the echo parameter can be programmed to OFF - in this case the MIDI cable simply acts as a substitute for a wall adapter.

If you don't have any MIDI outputs available, the Power Adapter can be used to provide power to up to 20 MIDI Solutions products.

Or, if you do not need to use the MIDI input of the MIDI Solutions product, and don't mind dabbling in electronics a bit, you can connect an external +5V DC power source to the MIDI input of the MIDI Solutions product as follows: Connect the ground of the power source to the center pin of the MIDI input jack (pin 2), and connect +5V of the power source to the two pins on either side of the center pin (pins 4 and 5). The outermost pins may be left disconnected. Please be sure to double-check the voltage and connections; MIDI Solutions will not be responsible for products that have been damaged by incorrect interpretation of the above instructions. Note that this workaround applies only to applications for which nothing else is connected to the MIDI input of the MIDI Solutions product. MIDI Solutions products will operate down to about 3.5V, so three 1.5V batteries supplying 4.5V could also be used instead of a 5V power supply. Or a 5V USB power source could be used as described in this article.


Q:  Why does the MIDI indicator LED not light up even though the device that is connected to the MIDI Solutions product is turned on?

A:  First of all, check the connections to make sure that it is a MIDI Out or MIDI Thru that is connected to the MIDI input of the MIDI Solutions product (not a MIDI In to MIDI In, or MIDI Out or MIDI Out). If the LED still does not light, then check that the MIDI cable you are using has all three of the centermost pins connected at each end; on rare occasions we've seen MIDI cables that do not connect the center pin, and although these cables will work with devices that are not MIDI-powered they do not allow the MIDI Solutions products to draw power. It's best not to use these cables anyway as this ground connection is intended as a telescoping shield to protect the MIDI data from outside interference. If you are sure your MIDI cables are fine then try connecting the MIDI Solutions product to a different MIDI device. The MIDI electrical specification has recently been updated allowing a lower voltage of 3.3V, however the MIDI Solutions products were designed to be compatible with the original 5V specification, so devices that follow the new specification will not power the MIDI Solutions products. We are currently working on redesigning the MIDI Solutions products to operate at this lower voltage, however in the mean time the problem can be resolved by first going into another MIDI device and then MIDI Thru from that device into the MIDI Solutions product. If you don't have another MIDI device available to make these connections, the MIDI Solutions Power Adapter can also resolve this problem. The Power Adapter has a MIDI In, MIDI Thru, and a power connection for a wall adapter (included). The Power Adapter can be used to provide power to the MIDI Solutions products by inserting it inline between the sending device and the MIDI Solutions product.

Following is a list of products that have been reported NOT to provide power to the MIDI Solutions products (some of these products are no longer in production):

- Aardvark DirectPro 24/96
- Ahlborn DS-26
- Akai MAX49, MPC500, MPD24, MPD226, MPK series keyboards, XR20
- Apple MIDI interface
- Alesis DM10, ControlPad, Micron, PercPad, Q and QX series keyboards, SamplePad, SR18, Trigger|iO, USB-MIDI Cable, VI49, Vortex
- Artisan Micro-MIDI Controller Board
- Arturia BeatStep, Minibrute SE
- Basyn MIDI Controller
- Behringer UMX490
- Boss FC-50, GT-5, GT-8, GT-10, GT-100, GT-Pro, RC-50, RC-300
- Brunetti Vector
- Cadac A,E,F,J-Type Consoles
- Cakewalk UA-25EX
- Classic Organ Works MIDIjetPro
- Clavia Nord C1, C2, C2D, Electro 3, 4D, 4HP, 5D, Lead 4, Modular G2, G2X, Piano 2, Stage, Stage 2, Stage EX
- Cyclone Analogic TT-303
- Dave Smith Instruments Mono Evolver Keyboard, Mopho x4, Poly Evolver, Prophet '06 and '08, Tempest, Tetra
- Digico SD8
- Digidesign 003 Factory and Rack, Command|8
- Digitech GNX4, GSP1101, VHM5
- E-MU 0404 USB 2.0, Xboard 49 and 61, Xmidi 1x1
- Echo Audiofire 2/8/12, Layla3G
- Edirol UM-1 and UM-2 USB MIDI Interfaces, UA-25
- Elektron Machinedrum MK1, Monomachine MK1
- ENGL Special Edition E670
- Eventide H9
- Faderfox DJ2, DX2, LD2, LX2
- Fagerström Technopipes
- Fatar Studio-37
- Focusrite Clarett, Saffire, Scarlett
- Fractal Audio Systems Axe-Fx Ultra
- Galanti Praeludium
- General Music pk5
- GigRig G2
- G-Lab GSC, GSC--2, GSC-3
- Hammond SK1, SK2, XK-1, XK-1c
- High End Systems MIDI/LTC Widget
- Hosa USM422
- iConnectivity iConnectMIDI1, iConnectMIDI2+, iConnectMIDI4+, mio
- IK Multimedia iRig
- Ion KEY 49
- JLCooper MCS2
- Ketron Audya
- Korg KP3, SP-250, earlier models of the Triton Studio, X50
- Kurzweil MIDIBoard, PC3LE, PC3X, SP4-7, SP4-8, SP5-8
- Line6 MIDI Mobilizer
- M-Audio Axiom Pro 61, Code 49, Keystation 61 and 61es, Midisport 1x1, 2x2, 4x4 USB MIDI Interfaces, Oxygen 25, ProKeys Sono 88, Radium
- Master Gaita Master Gaita
- Moog Little Phatty, MP-201, Taurus 3 Bass Pedals
- Musictech Music Maker
- Native Instruments Komplete Audio 6, Maschine MK2, Traktor Audio 10
- Nobels MF-2
- Nord (see Clavia Nord)
- Novation Impulse keyboards, nio 2/4
- Orla Ringway RS600EU
- Ploytec 34oneII
- Radikal Technologies Spectralis 2
- Redpipes Classic
- Rock Band 3 Wireless Keyboard Controller
- Roland A-37, AX-7 (older models), FR-3, FR-18, GR-20, HD-1, JV-90, PC Series keyboards, PK-5 (PK-5A does provide power), TD-4, TM-2, V-Piano, VG-99
- RME Babyface, Fireface 800, HDSP 9632
- Samson Carbon 49 and 61
- Starr Labs AirPower
- Steinberg Midex 8, UR242
- Strymon BigSky, Mobius, Timeline
- Studio Electronics Boomstar
- Studiologic MP-113, MP-117, Numa Nano, Numa Nero, Numa Organ, TMK 88
- Tascam 2488neo, DP-01, DP-02CF, US-122
- TC Electronic Flashback X4, G-System
- TC-Helicon VoiceLive Rack
- Technics SX-F100, SX-FA1, SX-G100, SX-GA1, SX-GA3
- Use Audio Plugiator
- Vestax PAD-One
- Voce MIDI Drawbar, V3
- WindWorks WW-BAT
- Yamaha 01X, AW2400, EZ-TP, GT1, GT2, i-MX1, KX8, KX61, MOX8, MOXF8, MX49, MX61, NP-30, NP-31, P Series keyboards, PSR275, PSR-S950, PSR-S970, Tyros5-76, WX7
- Zoom G9.2tt

Please send an email to if you discover any other products that should be added to this list.


Q:  Is it possible to modify the above products to enable them to provide power to MIDI Solutions products?

A:  If a device won't provide power to a MIDI Solutions product because it is not operating at the original MIDI standard 5V then no simple modification can be made to enable the device to power the MIDI Solutions product. The device's operating voltage can actually be confirmed by measuring the voltage at the MIDI output, the voltage can be measured between the center pin (ground), and the pin next to it in the counterclockwise direction. MIDI Solutions products will operate down to about 3.5V, if the voltage is less than this then no simple modification can be made to enable the product to power the MIDI Solutions product, a Power Adapter is the only solution. We are currently working on redesigning the MIDI Solutions products to be compatible with both the original 5V and newer 3.3V MIDI specifications.

In other cases the reason a product does not provide power is because pin 2 (the center pin) of the MIDI output has not been connected to ground as indicated in the MIDI specification. Pin 2 of a MIDI cable is connected to its shield, so even if the product will not be powering a MIDI Solutions product it is important that pin 2 is connected to ground so that the other conductors in the cable that are transmitting MIDI data are shielded from outside interference. This problem can be repaired by making a ground connection from another ground point on the product to pin 2 of its MIDI output. In some cases a ground connection can be found on the shield of an external jack, so opening up the product to find an internal ground connection may not be necessary and this external ground can be tied directly to the MIDI Solutions product's ground. The ground connection of the MIDI Solutions products is available at pin 2 of any of its MIDI jacks (with the exception of merger inputs 2 and higher). When making this connection be absolutely sure that the point on the product you are connecting from is ground - MIDI Solutions will not be responsible for products that have been damaged by incorrect interpretation of the above instructions, attempting this modification is not recommended for those unfamiliar with electronics. It would also be wise to first do a continuity test between the product's ground connection and pin 2 of the product's MIDI output to confirm that this is in fact the problem and this connection is missing.


Q:  Why not add a power jack to all of the MIDI Solutions products that could be used only if needed?

A:  Unfortunately connecting a power source to a MIDI-powered product will create a ground loop (see this FAQ). To eliminate ground loops all MIDI inputs would need to contain optical isolation circuitry. However, optically isolated MIDI inputs cannot draw power, and without any MIDI inputs that can draw power, a wall adapter would no longer be optional, but required for every MIDI Solutions product. Rather than require the use of a wall adapter for every MIDI Solutions product, we decided to offer the Power Adapter as a workaround for those cases in which power is not available.


Q:  Ignoring ground loop issues, is it possible to connect a power source in parallel with the MIDI source that is connected to a MIDI Solutions product?

A:  In theory this could work with the addition of level translation circuitry. For example if the MIDI source is operating at 3.3V, and a 5V power source is connected in parallel, then the incoming 0 - 3.3V data signal would need to be translated to a 0 - 5V signal in order to be recognized by the MIDI Solutions product. It's possible this could even work without level translation circuitry if the positive data source voltage exceeds the positive input threshold voltage. But even if it appears to work it may not be reliable since there is the potential for the threshold voltage to shift out of range in response to environmental changes. The MIDI Solutions Power Adapter both resolves the level translation problem and eliminates ground loops.


Q:  My MIDI Solutions product is operating intermittently, what could be wrong?

A:  Of course we would never rule out the possibility that a MIDI Solutions product could be defective, but it is a very rare occurrence. One thing that we have found to be very common however is bad MIDI cables. Usually it is an individual connection within a MIDI cable that fails - if the connection to pin 2 of a MIDI cable fails the MIDI cable will still work with other MIDI devices, but the MIDI Solutions product will not be able to draw power. If a connection is just starting to weaken the MIDI Solutions product may power on occasionally, while bending the cable may cause it to connect and reconnect, resulting in the MIDI Solutions product turning on and off. Check to see if bending the cable (usually close to one of the ends) with the MIDI Solutions product connected causes the LED to turn on and off. Note that it takes a few seconds for the LED to turn off when power is removed from a MIDI Solutions product, so try holding the cable in different positions rather than bending it back and forth quickly.


Q:  Do any of the MIDI Solutions products filter active sensing messages?

A:  We have found that the problems introduced by active sensing outweigh its benefits, therefore all MIDI Solutions products (except Thru boxes and the Power Adapter) filter active sensing messages.


Q:  Do the MIDI Solutions products use running status when sending MIDI messages?

A:  Yes, running status allows the number of bytes to be reduced by up to 50% when large amounts of MIDI data are transmitted, so it is used whenever possible. This is especially important when merging MIDI data as it can reduce latency when buffering of incoming data is necessary. The status byte is included with the outgoing message after brief periods of inactivity to ensure the receiving device is updated regularly with the current status. The MIDI specification states that a receiving device must always recognize running status.

Although very rare, we have received reports of a few devices that do not recognize running status, and requests from these customers for a product that forces the status byte to be sent with each MIDI message. We do not make a product that does this, however using the MIDI Solutions Event Processor it is possible to insert an extra MIDI event after specific incoming MIDI events in order to force the status byte to be sent with each message. For example, a channel pressure event of value zero could be inserted after each Note-on and each Note-off event changing the status to channel pressure, causing the status byte to be resent with each note.

Following is a list of products that have been reported with problems recognizing running status:

- Ahlborn Archive
- Axxess Electronics GRX4
- Electronic Theatre Controls Express 24/48, Expression 2X
- RJM Music Mini Effects Gizmo
- Roger Linn Designs AdrenaLinn


Q:  I have an older MIDI Solutions product, is there a way to find out if it includes a particular function?

A:  Since we are constantly adding new features to the MIDI Solutions products, older units may not include all of the functions described on our website. To find out if the product you own has a particular function implemented send an email to and we'll help you determine this.


Q:  I have a unique MIDI processing requirement that is not offered by any of your existing products. Do you do any custom work?

A:  Yes, we can make firmware modifications to our existing products (no hardware modifications). For more information see the Custom Products page.



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