I made it through my list of known bugs, and found new friends along the way (more bugs). Here's what changed for Synulator 0.0.3:

Features

• New HUD while synthesizing  - press "L" on the Keyboard to show an overlay of the controls
  • The keys light up!
• Implemented pitch activation while Mic Input is enabled (see last section)
• Added two more default presets: F7 and F8
• Added options for Grain Input, to adjust how attack, decay, or lifetime are assigned
• Added two more voices: Piano and Bass Guitar harmonics
• Added 7 additional scales, for a total of 11!
• Added settings to limit or expand the number of buffered frames
  • Lower numbers are more responsive, but can cause audio skips if the next frame hasn't been calculated in time

Fixes

• Fixed an issue with first and last grains, so sound is generated correctly when Maximum Grains is limited to 1
• Fixed problems with Ascending and Descending Harmonics Voice modes
• Fixed problems with scales, which were using ill-tempered intervals instead of nice ones
• Fixed problems with octave and voice changes, so they don't move 2 steps at a time
• Fixed smoothing for Triggers and Bend Pitch, especially helpful using Keyboard
• Improved performance for mic input, making it more efficient and responsive
• General performance and queuing tweaks, making everything as real-time as possible

Mic Input Quick Tips:

• Turn off "Always Play Fundamental" before turning on Mic Input (probably) 
• When no pitch is activated, Synulator rebuilds the recorded frequencies using grains
• When a Pitch Button or the fundamental is activated, Synulator attempts to shift the recorded frequencies (very chaotic)
• The Audio Preferences file has a setting to limit (or expand) the threshold for replication: MicDetectionThreshold