Docs: interface design updates and notes about Signal/Line

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-* Mono Synth MVP
-
-A Rust library that drives a GDNative script and exposes an interface for a
-monophonic Synth object. This object will produce audio frames which will
-fill Godot's ~AudioStreamPlayback~ buffer, leveraging the cross-platform
-audio I/O that Godot provides. The Rust dynamic library will need to be built
-for each platform, but it will leverage Rust's perfomance optimizations to
-enable realtime audio interactions.
-
-** Godot Synth Interface
-
-From Godot, we're primarily interested in manipulating various aspects of
-the Mono Synth. Frequency, modulation, amplitude, and any other expressive
-aspect of a single tone we can hook up. Overall volume will be controlled
-by Godot.
-
-*** Input
-
-- *Sample Rate* - Godot must send its I/O sample rate to the synth when initialized
-  This is the number of audio samples played back per second. So we need to generate
-  samples at the same rate.
-- *Frequency* - range from 20Hz to ½ the sample rate. increment may need to change
-  over the range. Human ear detects small changes at lower frequencies, but not as
-  much in the higher frequencies.
-- *Continuous* - whether or not to produce a continuous tone or use ADSR envelope
-- *Waveform* - a selection of basic waveforms will be implemented in Rust. We can
-  control which one is being generated via a switch in Godot.
-- *Phasor* - the shape of the waveform can be dynamically modified by changing the
-  shape of the phasor driving the oscillator. Given an (x,y) vector, the shape of
-  the phasor can be "bent" away from it smooth 0-1 slope.
-- *Amplitude Envelope* - this controls the volume of sound over time. Typical envelopes
-  have parameters for:
-  - *Attack* - amount of time before the waveform is at its peak
-  - *Decay* - amount of time it takes to go from peak to sustained level
-  - *Sustain* - the level (amplitude) to sustain while a note is held
-  - *Release* - the amount of time to go to 0 from sustain when note is released
-- *Filter* - a low pass filter with a two parameters:
-  - *Cutoff* the frequency where the filter begins
-  - *Resonance* ? i think its like an amplitude boost at the cutoff?
-- *Modulator* - a low frequency oscillator that can effect the frequency or filter cutoff
-
-
-*** Output
-
-Currently, the output is an array of (sample, sample) vectors, where each sample is
-a float between -1.0 and 1.0. You can request a certain number of frames, and get back
-the calculated samples to fill them. We can think of this as essentially the stereo
-audio jack from a synthesizer.
-  
-