REFACTOR

Just some refactoring notes...

# SoundBuffer

## addition or concatination

- [X] in-place add
- [X] add and copy
- [X] concatinate

## subtraction

- [X] in-place subtract
- [X] subtract and copy

## multiplication

- [X] in-place multiplication
- [X] mult and copy

## division

- [x] in-place division
- [x] divide and copy

## mix operator

- [x] in-place mix
- [x] mix into copy
- [x] right-aligned / left-aligned mixes

## built-in methods

- [x] blocks -- iterate over buffer in blocksize blocks
- [x] clear -- fill with zeros
- [x] clip -- hard clip to minval/maxval
- [x] convolve -- fft.conv
- [x] copy
- [x] cut
- [x] fcut -- frames
- [x] rcut
- [x] dub
- [x] fdub -- frames
- [x] env
- [x] fill -- truncate or loop to desired length
- [x] grains -- iterate over buffer in variable-sized grains
- [x] graph -- plot the waveform
- [x] mix -- mix in place with sound or list of sounds
- [x] pad -- pad with silence at start or end
- [x] pan
- [x] repeat
- [x] reverse
- [x] reversed
- [x] remix
- [x] softclip -- fx.softclip
- [x] speed
- [x] vspeed
- [x] taper
- [x] toenv
- [x] towavetable
- [x] trim
- [x] write

## computed properties

- [x] max 
- [x] mag -- absolute value max
- [x] min
- [x] dur -- framelength / samplerate

## misc

- [ ] cloud -- graincloud
- [ ] stretch
- [ ] transpose