Audiotent Tip 386. Re-Sampled Synth Chord Stabs.
Cut a short chord stab from a synth loop or take a synth one shot.
Next, load it into your favourite sampler. Now when you play you will be limited to the chord structure of the audio source.
Meaning, whichever key you play, the chord will still remain major or minor etc (depending on the initial sample).
This restrictive creative process was used to produce countless classic early underground records.