# Prost! diy device for connecting 2 midi hosts **URL:** \ **Category:** Organelle\ **Created:** [April 19, 2020, 9:48pm UTC](https://forum.critterandguitari.com/t/prost-diy-device-for-connecting-2-midi-hosts/5843 "2020-04-19T21:48:00Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![frederickk](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.critterandguitari.com/frederickk/32/3732_2.png) [@frederickk](https://forum.critterandguitari.com/u/frederickk)\ **Post date:** [April 19, 2020, 9:48pm UTC](https://forum.critterandguitari.com/t/prost-diy-device-for-connecting-2-midi-hosts/5843/1 "2020-04-19T21:48:00Z")
**[Prost!](https://github.com/frederickk/prost) uses Arduino Pro Micros as intermediary to allow Midi host to Midi host communication.** Prost! uses 2 [Pro Micro](https://www.sparkfun.com/products/12587) boards (or any compatible board or clone with an [Atmel 32u4 chip](https://www.amazon.com/s?k=32U4&i=electronics&ref=nb_sb_noss_2)) connected serially (TX/RX) in order to pass USBMidi data. Here’s a [demo video](https://www.youtube.com/watch?v=BwLtm9UBdX8) with [Ableton Live](https://www.ableton.com/), an [Organelle](https://www.critterandguitari.com/organelle), and [Norns/Fates](https://llllllll.co/t/fates-a-diy-norns-dac-board-for-raspberry-pi/). If you’re interested in building your own, check out the [Github repo with all you need to get up and running](https://github.com/frederickk/prost). > **[@frederickk](https://www.instagram.com/p/B_LRHCZBd3c)** Longer demo on [YouTube](https://www.youtube.com/watch?v=BwLtm9UBdX8) For now I’m using a simple protoboard, while I further test. In the future I’ll create a custom PCB to make hardware implementation even easier. [![Prost! IRL](https://github.com/frederickk/prost/raw/master/prost-irl.jpg)](https://www.youtube.com/watch?v=BwLtm9UBdX8) ---
**Author:** ![Tolsi](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.critterandguitari.com/tolsi/32/4349_2.png) [@Tolsi](https://forum.critterandguitari.com/u/Tolsi)\ **Post date:** [May 5, 2020, 7:10pm UTC](https://forum.critterandguitari.com/t/prost-diy-device-for-connecting-2-midi-hosts/5843/2 "2020-05-05T19:10:43Z")
Looks good, I order 2 32u4 boards and will try to build that! ---
**Author:** ![Tolsi](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.critterandguitari.com/tolsi/32/4349_2.png) [@Tolsi](https://forum.critterandguitari.com/u/Tolsi)\ **Post date:** [June 7, 2020, 4:18pm UTC](https://forum.critterandguitari.com/t/prost-diy-device-for-connecting-2-midi-hosts/5843/3 "2020-06-07T16:18:03Z")
Yesterday, a friend soldered me such a thing on a soldering breadboard (we had only one-sided, it was not easy). Installing boards on two sides, TRS jacks between them and wiring them takes out the brain. We assembled it with Sync Jack and MIDI-TRS and without buttons and LEDs. It works fine, I can use Sync to Pocket Operator and MIDI over TRS to Korg NTS-1 at the same time from Ableton (using one board connected to Mac). I have not tried to use it with Ableton and Organelle yet, but I think there should be no problems. It seems to me that there are not enough side photos to understand that the device is getting quite thick. Very useful thing, thanks for posting and good detailed documentation and board schema! ---
**Author:** ![frederickk](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.critterandguitari.com/frederickk/32/3732_2.png) [@frederickk](https://forum.critterandguitari.com/u/frederickk)\ **Post date:** [June 15, 2020, 11:23pm UTC](https://forum.critterandguitari.com/t/prost-diy-device-for-connecting-2-midi-hosts/5843/4 "2020-06-15T23:23:24Z")
great to hear it worked for you. I’m nearly done designing a board that would makes the form factor smaller and would add support for TRS Midi and analog sync (for Volcas, etc.). Once I’m done and tested I’ll post here for you or anyone else who might be interested. ---
**Author:** ![nicolasbulb](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.critterandguitari.com/nicolasbulb/32/3731_2.png) [@nicolasbulb](https://forum.critterandguitari.com/u/nicolasbulb)\ **Post date:** [June 17, 2020, 6:39pm UTC](https://forum.critterandguitari.com/t/prost-diy-device-for-connecting-2-midi-hosts/5843/5 "2020-06-17T18:39:30Z")
Hi there, I’ve started this thread: [Organelle USB Midi and MPC Live as a host](https://forum.critterandguitari.com/t/organelle-usb-midi-and-mpc-live-as-a-host/5970/7) Because I want to control some synth of the organelle with my MPC Live. I can’t find any infos about how to achieve that? Does your Prost! works as a standalone module? Many thanks, ---
**Author:** ![frederickk](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.critterandguitari.com/frederickk/32/3732_2.png) [@frederickk](https://forum.critterandguitari.com/u/frederickk)\ **Post date:** [June 17, 2020, 11:11pm UTC](https://forum.critterandguitari.com/t/prost-diy-device-for-connecting-2-midi-hosts/5843/6 "2020-06-17T23:11:00Z")
I responded to you in [that thread](https://forum.critterandguitari.com/t/organelle-usb-midi-and-mpc-live-as-a-host/5970/8)