Port many things from soundpipe

[stephenhensley]

Here is a list of modules to port from soundpipe:

• [x] adsr
• [ ] allpass
• [x] autowah
• [x] bal
• [x] biquad
• [x] bitcrush
• [x] blsaw
• [x] blsquare
• [x] bltriangle
• [x] comb
• [x] fold

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just a starting point, the list could go on

[stephenhensley]

closing because the last one is just about wrapped up.