Features:

- Available on Windows and Linux as VST (32 and 64 bit) and on Mac as Audio Unit or VST (Universal binary)
- Improved UI compared to TF3 which will visualize all modulations
- Uses an additive synthesis based wavetable generator
- The Noise generator can produce any frequency of noise with any bandwidth
- Lowpass, Highpass, Bandpass and an improved Notch filter are available
- 2 ADSRs and 2 LFOs that can be linked to pretty much any important knob using a modulation matrix
- Supported effects are Flanger, Chorus, Distortion, Delay, Reverb, EQ and Formant
- The effects stack allows for any permutation of up to 10 effects

Changes:

- When using no ADSR, instruments were cut immediatelly resulting in plopping. This is fixed.
- ADSR zero decay will no longer cause volume go up and cause things like reverb crashes or host going to mute.
- Saving an instrument caused the preset file to grow larger and larger due to appending instead of rewriting the contents.
- Restore instrument button did not work.
- Instrument count is now 1000.
- ADSR1 will not cut the note if ADSR2 is still going.
- Fixed Reverb width.

http://www.tunefish-synth.com/

 

This change log is funny. I think I will stick with Spire.