This Module is currently available.
Mini Sampler Looper
The latter is the mini sampler/looper and it has an AUDIO in and a REC trigger input or button. It can sample audio stuff (no CV, it is AC coupled) and reproduce (PLAY/LOOP, either button on trig inputs) it varying (either via CV or potentiometer) the sampling frequency. What do you mean by overdub? When recording it will not 'add' the new audio to the stuff inside but it will overwrite it...
The simplicity of the module match with the audio and sync performance of the technology used. The sampling is low-fi (but good, in my opinion) and the REC synchronization is not really accurate but the module is FUN and particularly useful in ambient/noise/wtf compositions.
The sample rate in playback mode can go approximately from 6.5kHz to 22kHz. Good recording could be achieved until 18kHz. Over this frequency (that's well beyond the chip rating) the recording will be erratic and many noises and clicks will be on the sample! Obviously the lower the sample rate, the lower the bandwidth of the module, cutting highest harmonic content...
The maximum length of the sample in the standard mode (see the 'OPTIONS' chapter would be of about 10s @ 8kHz.
https://www.sound-machines.it/product/ul1uloop/
https://www.sound-machines.it/cms/wp-content/uploads/2014/02/UL1uloop_Manual_Feb2014.pdf
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These merchants probably sell this module. Huh?