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AcidBoxMynah V1.2

moshang — Fri, 21 Aug 2026 05:47:03 +0000

This update fixes an issue with how drum kits are loaded. You may already have noticed that most of the supplied kits have silent sample slots, especially towards the end. The legacy AcidBox file system loads sample files in the order they appear, and the number prefixes were purely meant to order samples in the correct order in the folder.

We've added a new kit format alongside the original (to keep compatibility with the jukebox mode and older kits) where the the number prefixes 01_ to 16_ serve expressly to load a sample into a specific sample slot.

We suggest a .wav format of 16bit, 44.1kHz mono. Other types may work, but have not been rigorously tested.

We've added a new kit 3 in the correct format as an example. New instruments will have kit 3 pre-loaded, but download it here if it's not present for you. Unzip and place the folder named 3 in the Kits folder alongside the other kits on the SD inside ACIDBOX/KITS/

Download it here: NewKit
More info: DrumKits

RE: the top 2 row buttons are not working

moshang — Tue, 18 Aug 2026 01:00:44 +0000

@navs It shouldn't affect the buttons. As mentioned the shift registers for all the buttons enter the MCU on the same data lines - an upstream problem would likely affect all buttons.

RE: blue light flashing by usb port?

moshang — Mon, 17 Aug 2026 12:05:49 +0000

@navs Right, the ESP32-S3 Supermini comes with battery charging circuitry we don't use which includes the blue status LED. Unfortunately, the blue LED can't be disabled via code, and has to be desoldered to be disabled.

RE: the top 2 row buttons are not working

navs — Sat, 15 Aug 2026 15:34:00 +0000

hi no luck, i will try again when i get some flux next week.

i have a concern with the PCM5102 Module 'cause when I soldered that I did not have the right clippers and so may have not trimmed enough, looking at board there seems to be a gap between these pins and the SD card module but if not would that affect the top 2 button rows?

thanks

AcidBoxMynah V1.1

moshang — Sat, 15 Aug 2026 12:59:12 +0000

This update adds MIDI clock and pattern sync capabilities to allow either the AcidBoxMynah or the original version Mynah to sync to the other.

There's also an new Sweep part (press F7 once to enter) with some preset sweep effects that may prove useful when recording or performing. This part can't be sequenced, put it can be triggered from step buttons A1-B8 or via MIDI.

More details are here:
https://groovesizer.com/acidbox-mynah/

Here's the change log:

added Sweep part (F7)
added MIDI trigger support for Sweep part
added MIDI clock sync
added Pattern sync over MIDI
added delete for Patterns, Songs, and Banks
bugfix: pan was reversed on the pot

Firmware V1.3

moshang — Sat, 15 Aug 2026 12:53:55 +0000

This update contains a small delay on startup to make sure the power-rail has stabilized. It aims to prevent some weird behavior where the device will only start up when connected to USB power, but after that will run fine on batteries.

There are also a few small but important changes for improved MIDI clock sync:

Bugfix: MIDI clock master Mynah can lag behind slave on start/stop
Bugfix: MIDI sync is lost when the bpm of the master is adjusted

RE: the top 2 row buttons are not working

moshang — Sat, 15 Aug 2026 03:31:01 +0000

Hey Navs,

This sounds like a soldering issue with the shift registers ICs (see step 15 in the build in structions). Each row has its own 74HC165, but they all connect to the MCU on the same line - if one row works, it means the connection is fine. Resolder/reflow the pins on those shift registers and see if the other rows come to life. Good luck!

the top 2 row buttons are not working

navs — Fri, 14 Aug 2026 18:33:17 +0000

would this be a case of resoldering or is fault elsewhere? the bottom row buttons work, thanks for any tips

RE: blue light flashing by usb port?

navs — Fri, 14 Aug 2026 18:31:51 +0000

so the blue light flashing is the ESP32 chip indicating no battery attached; the continuous red light is the PCM5102 dac power on status

RE: blue light flashing by usb port?

navs — Thu, 13 Aug 2026 01:03:40 +0000

i should add i also have a red light by the headphone port? i dont see those lights on Floyd Steinbergs video; I am on firmware 1.0