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Petri is a sample player that generates its own sequences and selects up to eight
random samples from a folder of your choosing. It was designed to create glitchy,
IDM-inspired drum patterns very quickly. More than simply creating randomized
sequences, Petri uses a series of probability algorithms that respond to however
sparse or dense you would like the patterns to be, simply by dragging a slider. If
you prefer, all randomization can be turned off, and Petri can instead be used as a
traditional sample player with sequences input by hand using a familiar 8x8 matrix
Petri is $30 and there is a free demo available to try out the app.