An abbreviation for “10 volts peak to peak” with peak to peak being the difference between the lowest and highest voltage reached during a signal’s travels. This is a common voltage range for both audio and modulation signals in a modular synthesizer. The actual range is between –5 and +5 volts. See my diatribe above in the definition of 0–5v: The precise range may be varied to change the depth of their effect, so don’t get too hung up on specific voltage ranges. Pay more attention to whether they vary between 0v and some value, or swing in roughly equal amounts both above and below 0v (as 10vpp does).
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