Adding a variation of a standard digital delay (no frequency shifting) which allows for multiple "tap" positions to draw from the delay buffer. Rhythmic delay effects can be achieved by using irregular tap positions, ie: dotted quarter notes.

Notes:

• I've tried to make the taps parameter flexible, but any suggestions are welcome.
• synthio.BlockInput is not supported at this time. I don't see any immediate benefits from adding in that feature.
• This feature could be included into the audiodelays.Echo effect instead of its own, but doing so might add too much complexity.
• Currently, taps=None results in silent output. An alternative would be to have it act as a standard delay in this circumstance.
• I've re-written the ..._get_buffer(...) slightly to reduce complexity and flash usage. There are some performance drawbacks when not playing a sample through this effect directly, but that scenario is uncommon and the performance hit should be minimal. Another benefit is that trailing delays after a sample has ended should act properly.