I bought this for my pedalboard, as I have multiple midi controlled effects and didn’t want to daisy chain splitter cables. Out of the box the first impression is extremely cheap construction; this thing is made of lunchbox style plastic. It does power up, and it does work, routing midi messages to my pedals.HOWEVER. I noticed a massive increase in noise in my signal, and narrowed it down to this unit. I’m using a Strymon Zuma to power my pedals, so not a cheap non-isolated supply. The noise was more than I’d deem acceptable, so unfortunately I’m going to have to find a better solution. I gig regularly so I doubt the cheap construction would hold up anyway, but I was still disappointed.

This midi splitter works fine while on AC power, but I did try it only running on batteries and if the batteries aren't 100%, you'll get crazy notes through midi,

I use this device to sync clock and stop start across a set of devices such as Elektron Digitone and Digitakt as well as several Korg Volca units and a Make Noise 0-Coast. No problems encountered with any of this. The construction feels very cheap, but nothing that's a problem... and the price matches!

I’ve bought a couple of these (so this may be my second review, lol). Simply speaking, it’s a great splitter if you need a splitter. It takes one MIDI input (*NOT* an audio signal), and sends all the data from that input simultaneously to 4 different outputs. The splitter is powered, which matters in certain situations where unpowered splitters won’t work or might damage/confuse other gear ... for example the Retrokit cables for the Korg Volca series.You can power the Amptone splitter with a battery, or a standard stompbox-style AC wall wart (9v, center-negative). I just use whatever AC adapter was on my TC T2 reverb pedal.Good box. A little pricier than you might like, but splitters always are. On the other hand, this does the job, as opposed to rolling the dice on some half-baked Y-cable thing.

The MIDI standard has been around since the early 1980's, though the classic, round 5-pin DIN MIDI cables used on so many older synths have been replaced by USB MIDI connections on a lot of newer controllers and devices. However, since DIN MIDI was so ubiquitous for so long, and remains the only connection option on many "vintage" machines, the use of 5-pin MIDI cables has survived. In some cases, such as Korg's budget-friendly Volca machines, the DIN MIDI IN jack is the ONLY way to sequence the devices externally.But what happens if you have a 4 Volcas, or a Volca plus a drum machine and another synth - all requiring DIN MIDI? Since MIDI cables rely on digital signals supported by power, the solution is not as simple as buying a cable that splits the signal in two. In fact, when I looked into a solution for this problem there were surprisingly few affordable options that allowed you to take a single MIDI signal from your PC, iPad, or hardware sequencer, and run it into multiple DIN MIDI devices. A company called "MIDI Solutions" makes a Quadra Thru product, which is about $50 and reviews pretty well. But since the device is unpowered, I worried that a MIDI signal split 4 ways would be unstable, or that the output end of the splitter would fail to provide "MIDI Power" to certain devices that require it.Enter the AmpTone Lab Powered MIDI Splitter. It's essentially the same product as the Quadra Thru I referenced above, with one key difference: it accepts a 9V battery or a BOSS-style center-negative 9V adapter to power the MIDI signal. Setting it up with multiple Volca machines was a breeze, at least by MIDI standards. I sent a single MIDI cable out from my interface to the AmpTone Lab splitter, and then 4 MIDI cables out from that to each Volca. Set up each synth/drum machine to operate on a separate MIDI channel, and then can control all 4 of them simultaneously from Ableton, Cubasis, or any other MIDI sequencer or hardware sequencer.One key note about MIDI power - I found that the MIDI power DOES work through the AmpTone Lab splitter, but the box itself does not generate MIDI power like some "MIDI Thru" solutions might. I have two devices that require MIDI power. One is a RetroKits RK-002 MIDI Cable (which is basically just a cord with a microprocessor inside that can run specialized firmware to expand MIDI control of certain devices), and the other is the Ploytec PL2 synthesizer, which is the size of an engagement ring box and runs completely off of MIDI power. The AmpTone Lab splitter was able to supply power to these devices, but only if the controller or interface fed into the input side of the box is supplying MIDI power to begin with. For example, my microKORG XL+ works with MIDI power, so it could control the RK-002 and PL2. But other MIDI-compatible keyboards (such as my hilarious Rock Band keytar with a MIDI jack) cannot.I recognize that $60 may feel a bit steep for what this box does, but there really isn't a more cost-effective way to do this simply, and it can potentially add tons of functionality to hundreds of dollars of other MIDI gear that you already own. It's a compact, simple solution that just seems to work.

Up and running. Single source to multiple destinations. Powered too, which is what you need. I used a standard effects pedal power connector, and boom, done deal. Extremely well made and simple design. In my case, I had multiple DAW's in a studio, and had to reach all of them using a single keyboard, and it did the trick perfectly.

After getting inspired by some personalities on Youtube, I decided to get some of my electronic musical gear set up and try to jam some songs on them, without using my DAW (Digital Audio Workstation).I'm using a Novation Circuit as my tempo master and drums, and am using MIDI to send note data patterns to two synthesizers (I swap them out on occasion, but a few I've used are my Arturia Minibrute, Korg Minilogue, and Yamaha Reface DX). I quickly realized I needed a MIDI splitter to keep everything in sync without MIDI messages getting crossed up.This splitter works great. Tempo and note data messages flow through this unit fine. I can't speak for CC messages, since I haven't really gotten into trying to use them without a DAW yet. Oh, and while I haven't tried it, I'm sure if want to run multiple hardware synths into my DAW, this splitter will work well with my Focusrite Scarlett 2i4 interface.While I don't travel much, I still appreciate how portable this little guy is. Heck, I'm running it on a battery, even though I'm sure I have a suitable power supply laying around somewhere. I haven't had this unit for very long, but every time I turn it on, it does what it's supposed to do, so I'm feeling confident in it's reliability.

I use this to split midi signals from a Launchpad Pro to two computers. I have lost a few messages to the second computer causing a world of hassle. Ended up having to run TWO of the outs to two separate MIDI interfaces on computer #2 to ensure messages aren't lost. Bummed.