I don't rememeber when a Tiny 'music tool' amazed me like this one.
Realy impressed by possibilities, i still could not finish to learn all the stuff, 'cos when i begin, i can't stop making music, forgetting everything else. Or just testing it on all my gears, even ones with good built-in arpeggio.
Thank you Hotchk155

Broke it (the little end pieces where it connects snapped off) after dropping the assembled item on a wood laminate floor from height of just under a meter. Wasn't expected it to be super tough or anything but just a warning for others to be careful as it is brittle.

Also totally agree with the other reviewer that it was tough for my big fingers to get some of the bolts on. This was actually the reason I dropped it.

Nice stand once assembled.

This splitter is very usefull and I think it is the only modèle available with such number of outputs.
I use it to control korg volcas series ( keys, beats, etc...) And other synths.

It is well built And seems to last long.
Design is very cool by the way :)

Also the fact that it can receive any power from 9 to 12v, in any polarity is real plus !

Shipping was good, delay as expected. The maker was kind to reply my email, no bad surprises. (Ship to France)

I recommend !

The product came relatively quickly and was well-packaged. The information about the product was all very clear and the design was well thought-out . The product looks and feels very solid and well-made, and most importantly, it works fabulously! This is a vendor that's knowledgeable and worth trusting. Thanks!

Built this in a couple of hours - build instructions are excellent. the Arpie worked perfectly except for the external clock which although the clock led pulsed happily and F8 midi clock messages were being received the arpie would not recognize it and was silent when trying to use it.
I finally found that in order to get this to work the Arpie needs a midi Start (FA) message or a continue(FB) message then it works a treat.
(A midi stop (FC) also stops it)

Perfect tool for midi jamming or sync devices, the seller answer very fast and nicely. The modes wich can work are very usefull.

It came within a few days (uk delivery) and came well packaged.

Took about 2 hours to build the kit.

Would get this for everyone if i could!

I'm able to control each synth together from my DAW plus the possibility to syncronise their own sequencers with the metronome. For someone who discovers the midi thru it's more than expected... Thank you!

You know, one never really thinks the need a MIDI hub... well it is not your first thought anyway. Now that I have this hub, I can safely say how cool it is and a wonderful utility. Love it!

Finnaly got round to build this. Straight forward build with good instructions. And what an amazing product! BRAVO!!

It does what it's supposed to with no difficulties. That's the best review I can leave. I rated 5 on documentation because it has none and it has none because it needs none. That's a win in my book.

I ordered the Aprie to the US and shipping/packing was perfect - as described and better than expected. Very organized package. I soldered all of the components together using the included instructions with no issues, and it worked on first power up. Instructions are great, product is great, and I've spent a lot of time playing with it! Well worth the time. Thank you for this.

Very good product and great value. I use it to sync a volca beats, kp3, kossilator and mini korg for live electronica. Thanks m

Very good product and great value. I use it to sync a volca beats, kp3, kossilator and mini korg for live electronica. Thanks m

This is my first soldering project. After a couple hiccups and some helpful advice from Jason, this thing is fully integrated into my live rig. I am using to to control a Moog Minitaur and a Roland JP-08 interfaced by a MOTU MIDI Timepiece AV and clocked via a Korg EMX. I did find that the random mode (the mode I most often use) wasn't quite random enough. It would repeat the same random sequence over and over again. However due to the open-source nature of the kit, a couple lines in the code fixed that right up, and now it's fully random. Great piece of equipment!

Perfect little gadget, very solidly made (plastic base really helps), really bright my gear together. Was having trouble clocking everything before, but this seems to send out a strong enough signal that various items (Roland tr-8 drum machine, korg kaos pad and kaossilator) sync up nicely.

Very easy to follow instructions and an excellent overall product. Be aware though that soldering is required to assemble.

Now i have this little chord monster for my synth collection! work fine, i already start to think about mini keyboard for live impro with one hand)

Un arpégiateur-quasi-sequenceur hyper complet en kit (facile à monter), de qualité (composants t PCB), qu'aucun fabricant connu n'a penser à proposer et surtout à ce prix. En bonus et en option : une synchro CV, la possibilité de le mettre à jour via USB et un module externe de réglages rapides par potentiomètres. J'ai eu autant de plaisir à le monter qu'à l'ajouter à l'un de mes synthés. J'en prendrai sans doute un autre pour compléter d'autres machines.

This is easy to build and amazing fun to play with. Get one now. NOW! My neighbours are under the impression I'm now amazing at keyboards and yours can too. Now.

Useful piece of component & software for building the Arpie, such a nice little machine ! Thanks man, hoping new stuff is on your mind ! I'll definitely buy it blind !

I'm delighting with this so little yet powerful, loaded with options, little piece of technology, this is so much fun playing while trying all parameters.

This piece of PCB is wonderful, best small item/big idea in the area ! Keep going Mr, you're doing nice stuff :-)

I purchased this product to reroute signals in my guitar processing rack. Using a Gordius Little Giant foot controller, I can change the state of any/all relays with a single footswitch press. This product is by far the most cost effective means of accomplishing the required task.

I encountered my only difficulty when trying to use the Little Giant to program the relay configuration in programming mode. The documentation presents the midi data for configuration in hex. After some experimentation, monitoring the output of the java app in Midiox, I was able to determine that the configuration data consists of simple control change commands that many midi controllers can send.

I assembled the following chart, and present it here in case it can be of help to others such as myself.

Set relay to respond on a specific MIDI channel
CC# Value Comments
99 0 to 7 Selects which port (relay) to configure. Value ranges from 0 (port a) to 7 (port h).
98 1 Value of 1 selects the channel number parameter as the one to be configured.
06 0 Value will always be zero when configuring the channel number parameter.
38 0 to 15 Sets the relay to channel (value + 1). Value ranges from 0 (ch 1) to 15 (ch 16).

Set relay to respond to a specific note number
CC# Value Comments
99 0 to 7 Selects which port (relay) to configure. Value ranges from 0 (port a) to 7 (port h).
98 2 Value of 2 selects the note number parameter as the one to be configured.
06 0 Value will always be zero when configuring the note number parameter.
38 0 to 127 Sets the note number to which the relay will respond. Refer to a midi note chart.

Set relay duration for note on/off configuration
CC# Value Comments
99 0 to 7 Selects which port (relay) to configure. Value ranges from 0 (port a) to 7 (port h).
98 3 Value of 3 selects the duration parameter as the one to be configured.
06 0 to 127 See below.
38 0 to 127 See below.
Both values will be zero to retain relay state until note off (or on) message is received. Non-zero values must be calculated. Perhaps someone can figure out and post a formula. I always use zero values in my application.

Set relay duty cycle
CC# Value Comments
99 0 to 7 Selects which port (relay) to configure. Value ranges from 0 (port a) to 7 (port h).
98 5 Value of 5 selects the duty cycle parameter as the one to be configured.
06 0 Value will always be zero when configuring the duty cycle parameter.
38 64 Value ranges from 0 (relay disabled) to 64 (100%) duty cycle.

Set relay to be non-inverted or inverted
CC# Value Comments
99 0 to 7 Selects which port (relay) to configure. Value ranges from 0 (port a) to 7 (port h).
98 7 Value of 7 selects the invert parameter as the one to be configured.
06 0 Value will always be zero when configuring the invert parameter.
38 0 or 1 Value can be 0 (non-inverted) or 1 (inverted).

Store configuration to EEPROM
CC# Value Comments
99 100 Value will always be 100.
98 1 Value will always be 1.
06 0 Value will always be 0.
38 1 Value will always be 1.


PS. The formatting was destroyed upon upload to this review board. The CC#, Value, and Comments columns were squashed together into one unreadable mass. Knowing these are three separate columns might make it easier to decipher the information in each section.

I only originally bought this to let me chain midi stuff but I've found the midi clock function really useful and now use it to sync Ableton with various Volcas and hardware sequencers. Need a midi merge next (or switch box) so I can add the Arpie and Le Strum :-)

Great DIY for beginners - I guess. It took me like 2 hours or so to finish everything and it worked at first shot! Very good and detailed walkthrough for the soldering process, as well as for debugging issues.
I can suggest this kit for soldering starters... ;-)
Flavio.

I already have Arpie so I finally decided to buy myself Le Strum as well. It works perfectly as I expected with my JX8P, furthermore, it surprised me that I can use LS for sending MIDI to Arpie with great results .

So glad I could get the new firmware on a chip as the whole uploading new firmware is beyond my limited abilities.

I assembled the kit today and all eight channels are working perfectly. I couldn't be more pleased with my purchase. Seller was easy to get ahold of and was happy to answer my questions.

The kit arrived in great condition, all parts were safely wrapped. Documentation was thorough and relatively easy to follow, even for someone with no previous experience like myself. The configuration app worked fine, but was a little tricky to figure out at first (be sure to read the instructions very carefully)

Thanks for the great product.

Was easy to assemble. Clear instructions and parts fit well. Worked first time around. Would highly recommend.

I built it in two hours, just relaxed, enjoying assembling, building the unit and placing the parts as described by the manual.
It has a very clear description of the parts, and where to put them on the boards.
No questions here.
When finished, it worked instantly and I love the the way it works.
After fiddling about with the buttons for a few minutes, you get a clear picture of it's cappabilities.
Much of the functions speak for them selfs, and if not, there's always the manual.

Missing anything?
Yes, I would like to see a bypass or THRU function, which keeps the unit in the MIDI chain and allows you to play your live played parts as well.

I ordered a ARPIE case, which came a few day's later because Jason had some trouble with his 3-D Laser cutter.
Communication was very clear and helpfull about this small issue, no problem there...
But the front panel offered not as much protection to the buttons and LED's as I expected.
There's no cut out per LED or switch, leaving these parts as unprotected as is whithout the ARPIE case....

Overall, I give a BIG BRAVO to Jason, offering this small but fine piece of MIDI gear to the world!
Keep up the good work....

Best regards,
Aad

This product really works stable and plug and play. Great purchase! A housing for the device would be great, but we can work without...

Good and solid product. Easy to build and and modify. Late review, came here to buy the 4.x chip and the sync pcb. :P

I've now bought and constructed a number of products from hotchk155. I cant fault the quality of the components, the construction of the pcbs or the documentation. I'd recommend le Strum and Arpie to anyone thats interested. Easily constructed they do just what appears in the tindie videos