Groovesizer has been quietly building a reputation in the DIY music hardware space for some time, and their latest release looks set to add another solid entry to that catalogue. The Mynah is a compact, six-voice polyphonic sampler powered by an ESP32 microcontroller, available as a build-it-yourself kit or fully assembled for those who would rather get straight to making music.
At its core is a 16-bit, 32kHz ADPCM audio engine, which gives it the kind of warm, crunchy texture associated with classic hardware samplers. It is not chasing pristine fidelity, and that is very much a deliberate design choice. Recording is handled via a built-in INMP441 omnidirectional MEMS microphone or line-in through a PCM1808 stereo ADC, with up to 27.6 seconds available per sample slot. You get up to 16 samples per song, with over two minutes of total storage across those slots, all sitting on an SD card of up to 32GB. Three sample playback modes cover single-shot triggering, 16 equal slices, and transient-detected slicing, giving the Mynah reasonable flexibility depending on whether you are building beats or working with field recordings.
The sequencer runs to 16 steps with adjustable pattern length, a tempo range of 30 to 300 BPM, swing control, and step conditions for both generative and deterministic variation. There are 16 pattern slots per song, 16 songs per bank, and 16 banks in total. Effects-wise, each voice gets individual control over pitch, velocity, pan, delay send and reverb send, while the master section handles delay, reverb, low-pass filter and bit crusher. A dedicated master FX section adds gater, filter, phase/chorus and a combo mode.
Connectivity covers hardware MIDI in and out via 3.5mm TRS jacks, MIDI clock sync, and USB-C for both power and data, which also handles communication with a companion web app for SD card browsing, sample management, and high-quality stem export. No additional drivers are required on macOS, Windows or Linux. The Mynah also runs on three AA batteries, so it is genuinely portable.
On the build side, Groovesizer say that basic soldering skills are all you need, and the kit comes complete with the PCB, enclosure and all components. For anyone who would rather skip that process entirely, a fully built and tested option is available. It is worth noting that while Groovesizer share schematics and enclosure design files with the maker community, the firmware and PCB design files are not currently offered as open source.
The Mynah is listed as coming soon. More information and tech specs are available at groovesizer.com
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