<div>Hi,</div><div><br></div><div>First of all, I want to say that Grainstorm is genuinely one of the best granular synthesis apps I've ever used. The sound design possibilities, the interface, the overall feel of it... it's a reference. Seriously impressive work, thank you for building this.</div><div>I'm using Grainstorm on a Google Pixel 7 Pro (Android 13) with a custom BLE MIDI controller (ESP32-based, advertising standard BLE MIDI service UUID 03B80E5A-EDE8-4B33-A751-6CE34EC4C700).</div><div><strong>Bug:</strong> When using MIDI Learn, I can successfully map the first encoder/knob to a parameter. However, to map a second encoder to a second parameter, I have to fully quit and relaunch Grainstorm. This repeats for every new mapping — one restart per assignment.</div><div><strong>Steps to reproduce:</strong></div><div>Connect a BLE MIDI device to Grainstorm</div><div>Enter MIDI Learn on parameter A → move encoder 1 → mapping works</div><div>Enter MIDI Learn on parameter B → move encoder 2 → no response</div><div>Save MIDI mapping, quit and relaunch Grainstorm</div><div>Import MIDI mapping, enter MIDI Learn on parameter B → move encoder 2 → mapping works</div><div><strong>Notes:</strong></div><div>The BLE MIDI controller sends CC messages only when a knob is mooving and correctly — verified with aseqdump on Linux, all 8 encoders respond without any interruption</div><div>The issue is reproducible 100% of the time</div><div>Workaround: restart the app between each mapping</div><div><br></div><div>Thanks again for this incredible app, and for taking the time to read this!</div><div><br></div><div>-0o-</div>

Grainstorm

Bug Reports

MIDILearn bug — requires app restart between each mapping

<div>A quick follow-up to my previous email with two important details I forgot to include:</div><div><strong>1. Grainstorm version:</strong> 1.9.5</div><div><strong>2. The bug is not specific to BLE MIDI</strong> — I tested again using a USB MIDI controller (wired connection via USB OTG, not Bluetooth) and the exact same behavior occurs: MIDI Learn works for the first mapping, then I have to fully quit and relaunch the app before I can map a second parameter.</div><div>So it looks like the issue is in the MIDI Learn logic itself, not in the BLE MIDI handling. Same workflow on both transports:</div><div>1st mapping </div><div>2nd mapping,  no response</div><div>Quit + relaunch → next mapping works </div><div>Hope this helps narrow it down. Let me know if you'd like additional logs or a video demonstration.</div><div>Thanks again!</div><div><br></div>

<div>Hi Fancho.</div><div>Yes - this bug was introduced in the last update. I have already corrected it and published the corrected version via Google Play. Please wait a day or two for the update to become available. Thank you for the report.</div>

<div>Hi Patrick,</div><div><br></div><div>I've updated Grainstorm, the MIDI learn works like a charm!</div><div>Having MIDI integrated is really great, it multiplies the possibilities for live use. Brilliant stuff.</div><div>Thanks for that, and for everything else you've put into the development.</div><div><br></div><div><br></div>