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Could someone explain SMP/HLD

SMP/HLD is short for Sample and Hold, which is also an old analog synthesizer technique. You capture (SAMPLE) the value of an input waveform (often white noise) every so often and the HOLD it until the next sampling point. It gives a stepped BLEEP.BLOOP.BLIMP sound but usually with a random sequence.

So, you are wondering – what is the difference between SMP/HLD and RANDOM ? The answer is that RANDOM is the input to the sample/hold process, the output of which will be random steps.

SQUARE was so good we listed it twice in early versions of the software – when you upgrade to the latest version, one of them will go away.