Highlights
- Soft drive knob now responds to the Drive amount. It was previously a fixed cubic clip with no knob behaviour.
- Hard, Diode, and Fold drive modes hold loudness as drive rises. Pushing them used to make the signal quieter.
- Filter type changes mid-note now fade in over ~10 ms and flush stale state, so automating the type stops clicking.
- Disabling the Filter+ section is instant rather than sweeping the HP cutoff down through audible frequencies.
- Synapse output gain trimmed close to unity so it lines up with the other filter types in a mix.
- Res-Comp now applies to Synapse alongside the other SVF-based types.
- Sing fold rolls its harmonic count down near Nyquist so high cutoffs alias less.
Details
v1.0.3 is a pure audio quality pass on Filter+. No new controls, no new presets. The goal was to fix a handful of issues that were subtle individually but added up to a section that did not always behave the way the knobs implied.
The biggest one: the Soft drive mode was ignoring the Drive knob entirely. It was running a fixed cubic clip and producing the same curve at Drive 1 and Drive 10. The knob now actually shapes the saturation. If you have a preset that used Soft drive, it will sound slightly different. The trade is that the knob does something now.
Three of the drive modes (Hard, Diode, Fold) used to apply a post-clip 1/drive normalisation, which meant that pushing the knob past 3 or 4 made the signal quieter rather than louder. They now hold loudness as drive rises, matching the tanh family. Same trade: presets that lived in that bypassed quiet region will be louder. Easy fix on those is to back off the synth output a couple of dB.
A subtle one that mattered a lot: changing the filter type on a sustained note used to leave stale state inside the SVF integrators, so switching from LP24 to BP and back would inject a transient. Every type change now resets the relevant state and fades the output in over ~10 ms. Mod-matrix automation of filter type is now safe.
The Filter+ section header power button used to take 10 ms to disengage because every smoothed parameter rode its ramp down from the user's value to neutral, which on the highpass cutoff sounded like a downward filter sweep. The toggle is now instant in both directions.
Synapse output runs about 3 dB quieter than before so switching between LP24 and Synapse on the same patch does not produce a level jump. Res-Comp also applies to Synapse now, so it can be trimmed when high Q is making the resonance peak too forward.
On the Drive modes more generally: at modest drive settings most of the modes sound similar because every saturation curve is approximately linear with a smooth knee around the rails. The personalities only emerge clearly at higher drive amounts, on rich source material, or when combined with high resonance where the feedback-aware modes (Aurora, Halo) modulate the resonance ring. This is expected behaviour, not a bug. If you want to A/B the modes audibly, push drive to 5 or above and use a sawtooth or square as the source.
Plus a handful of smaller items: the series highpass resets cleanly across its 20 Hz bypass boundary, Comb and String feedback get a transparent soft clip so extreme drive plus high resonance no longer pushes the closed loop into runaway territory, the Drive knob is now smoothed per sample like every other Filter+ knob, and MorphSVF plus the parallel Sing bandpass cache their ZDF coefficients so the hot path runs lighter on CPU at high polyphony.