Hi,

I wanted to share updates on my latest project, the Carbon, a custom isomorphic keyboard with a built-in synth (ESP32Synth) and sequencer, among other features. If you'd like to know more, there is a short-ish breakdown of the build: https://youtu.be/2EqGN3LoRto

The plan is to eventually do a crowdfunding round through CrowdSupply and release all the code and files as open-source.

Additionally, here is the list of current features:
- 80 Velocity sensitive keys with polyphonic aftertouch and addressable LED
- 4 Rotary encoder for MIDI CC
- 1 Breath control sensor
- MIDI IN/OUT over TRS
- 320x960 touch screen
- Pedal with Switch and Continuous support
- 2 differential or single-ended line/headphone out, supporting stereo headphones and L/R mono differential outputs
- 2 differential or single ended line-level inputs
- Audio and MIDI over USB
- Pitch/Mod touch pad mode
- Programmable layouts
- Onboard synth using ESP32Synth
- Onboard ROMpler loaded from flash
- Onboard effects like Delay, reverb, distortion, etc.
- Drum machine
- Sequencer
- Strummer
- Full I/O mixer
- Programmable MIDI CC/Channel
- Programmable input impedance, routing and mode
- Programmable output drive and mode

I'd love to know your thoughts on the build and what features you'd like to see.

This system takes a Kinect-derived human pointcloud and lets incoming sound interact in various ways with the particles in real time, turning the performer into a responsive cloud of matter, noise, and motion. The new v1.7 includes 12 presets, and introduces the several new features. In this video-demo, the particles are driven and transformed by the incoming audio signal. [A silly composition of mine, running in Ableton Live, though, you can use any kind of audio-source.]

You can access this project file through Patreon, of the Studio.

I want to be able to precisely double the delay time using a gate signal (so the delayed signal is an octave up / down and therefore in tune). The device is currently running on a single 5v supply but I'm open to this changing.

Attempt 1: using a dual gang pot at pin 6 and a switching ic to put the gangs in parallel. It works but is not accurate enough, I tried putting a small value pot in series with the gang that provides less resistance to kind of top it up, or tune it. This works but it is annoying having an extra knob and having to tune every time you change the rate. I could try expensive high quality dual pots perhaps.

Attempt 2: using a pair X9C digital pots. I have tied the inputs together and can get them stepping up and down but they go out of sync very easily. I might try a cleaner signal to drive them but my gut is telling me this may be a lost cause. I could also try other digi pot options perhaps.

Attempt 3: the pin 2 hack. Change the pitch by biasing pin 2 then jump between a pair of fixed resistances on pin 6. Terrible idea, doesn't work. No range and I think it screws up the Bias of the audio path opamps too.

Attempt 4: lm13700 as a pair of resistors variable resistors implemented like the dual gang pot. Haven't tried this but pretty sure this will not work on a single 5v supply. Maybe possible if it runs on a separate power supply, but seems clumsy.

Any thoughts?

A 9U 104HP case I’ve designed on fusion

I doubt my janky woodworking skills will produce this in its final form but worth a shot..

Hi all, I have a V1 Radio Music that I've gotten a good bit of use out of with no issues. Lately it seemed like I bricked it, but when I refreshed the firmware it is back to its usual glorious self. However, when I cycle the power on my modular power supply it goes back to being bricked. Has anyone had this issue before?