Reverts the sustain-relative modulation that made F.ENV SUS and the
cutoff knob feel dead while a note was held. The envelope now modulates
up from the base cutoff; at env amount 0 the cutoff equals the knob, and
lowering env amount darkens the held tone as expected.
Also extends the filter to 24/48 dB modes (extra TPT stages), adds the
matching combobox options, gives knobs a real blurred drop shadow, and
updates the AGENTS.md filterType choice count.
- Rename section labels: COMPRESSOR → COMPRESSION, AUTO-PAN → PANNING
- Replace spectrum analyzer bars with smooth gapless filled wave
- Use gold (#c59c07) for wave/spectrum strokes and piano roll active keys
- Amber CRT-style patch LCD with dark background and gold dot-matrix text
- Add MIDI signal LED with glow between semi and scale controls
- Reduce VU meter sensitivity (5x → 1.5x) and match amber gradient theme
- Add subtle glow behind section and sub-section boxes
- Fix Compressor.h class name and PluginProcessor include to match
- PresetManager: add ~40 new presets including a new Techno category with
LFO-to-OSC-pitch movement, plus Bass/Lead/Pad/Keys/Brass/Strings/Wind/
Arp/Pluck/FX expansions
- UI: add RANDOM button; highlight the currently selected entry in all
dropdown menus (incl. ticking the active preset in the preset browser)
- LFO depth: finer 0.001 step with a skew curve so the lower range resolves
much finer than the upper range (shared by LFO1 and LFO2)
- DSP: fade out active voices over 250ms on preset change / randomize so long
release tails from the previous sound are silenced
- Update bg.png
