Issue with Ableton and midi "feedback"

[nicolasvair]

Hi,

First thank you for this fantastic repo. I'm doing a "4 knobs" wireless controller using encoders and led ring.

The idea is to be able to control a parameter from various devices and have led feedback on each of them. The other being midi fighter twister is also based on encoders and led rings.

I came across a strange behavior, if arduino is connected to computer through BLE-midi, I have a strange behavior on ableton parameters mapped to midi CC. Not sure how to describe it, it is jerky.

Enregistrement.de.l.ecran.2024-04-14.a.13.28.17.mov

Important to note, this is independent of my code. I can upload a bare minimum code for connecting, and still have the issue. Even without :
MIDI.setHandleControlChange(OnControlChange);

For example I have the issue with this code :

#include <BLEMIDI_Transport.h>
//#include <hardware/BLEMIDI_ESP32_NimBLE.h>
//#include <hardware/BLEMIDI_ESP32.h>
//#include <hardware/BLEMIDI_nRF52.h>
#include <hardware/BLEMIDI_ArduinoBLE.h>
#include "Arduino_BMI270_BMM150.h"

BLEMIDI_CREATE_DEFAULT_INSTANCE()

unsigned long t0 = millis();
bool isConnected = false;

void setup()
{
// MIDI INIT
MIDI.begin();

pinMode(LED_BUILTIN, OUTPUT);
digitalWrite(LED_BUILTIN, LOW);

BLEMIDI.setHandleConnected( {
isConnected = true;
digitalWrite(LED_BUILTIN, HIGH);
MIDI.sendControlChange(1, 1, 1);
});

BLEMIDI.setHandleDisconnected( {
isConnected = false;
digitalWrite(LED_BUILTIN, LOW);
});

}
void loop()
{
MIDI.read();
}

Maybe related to how the arduino send a "confirmation" of the received CC from ableton ?
When I look into details, ableton sends values like : 24, 25, 27, 22, 29, 32, 35 ...

But it only happens with this device and this repo. I thought it may be related to bluetooth latency, but I don't have any issue using TouchOsc on iPhone...

Any hints where to look at ?

Thank you 🙏

[lathoub]

Hi, nice work!
This issue might relate to the underlying MIDI library. Have you searched the issues section for CC related issues?

(This library is a thin wrapper around FortySevenEffects MIDI lib)

[nicolasvair]

Hi, thank you for the quick reply !

I just searched the issues but could not find anything related.

[lathoub]

I'm going to recommend to create a similar issue (and also point to this one) in the underlying library git. The community there is much better to respond to CC problems.

[nicolasvair]

Ok, thank you then

If anyone is looking for a solution, the new issue is here : FortySevenEffects/arduino_midi_library#346

[nicolasvair]

Hi,

So after some more research, it seems that the midi gets "reflected" like a midi thru situation.
(like this post)

Unfortunately, the function MIDI.turnThruOff(); didn't help :(

[lathoub]

Bizar, MIDI thru has been switched pff

Arduino-BLE-MIDI/src/BLEMIDI_Transport.h

Line 55 in 929c2fc

static const bool thruActivated = false;

Can you check in the underlying lib if MIDI Thru has been switched off (breakpoint or log message)