Proper implementation mono/portamento/glide in synths

dendy

Here list, am I missing something ? Did I forgot something ? Any feature related to this topic you would like to see in synth and it is not covered by description bellow ?

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1) MONO NOTE PRIORITY
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PRIORITY (applies in MONO) decides which held key sounds when you hold more than one:

• LAST — the most-recently pressed note sounds; releasing it falls back to the most recent note you're still holding. (Modern default — Serum/Vital style.)
• LOW — the lowest held note always sounds. (Classic Minimoog style.)
• HIGH — the highest held note always sounds. (Classic ARP style.)

Example (LAST): hold C, press E → you hear E; press G → G; release G → back to E; release E → back to C.
Example (LOW): hold C, press E and G → you still hear C; release C → it jumps to the lowest note still held.

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2) MONO ENVELOPE — LEGATO vs RETRIGGER
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MONO ENV (applies in MONO) controls what the envelopes do when notes OVERLAP (you press the next note before releasing the last):

• LEGATO — overlapping notes do NOT restart the envelopes; only the pitch changes. Smoothest, most connected feel.
• RETRIG — overlapping notes RE-ATTACK the envelopes (you hear the attack on every note). The retrigger is click-free.

Either way, the first note after silence always plays a fresh attack. MONO ENV only affects connected notes.

Use LEGATO for fluid lead lines and 303-style slides; use RETRIG for percussive basses where each note should bite.

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3) PORTAMENTO / GLIDE
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Glide slides the pitch smoothly from the previous note to the new one. Three controls:

GLIDE (knob)
The glide time. Fully left = OFF (instant). Turn it up for longer slides (up to several seconds). The readout shows ms or s.

GLIDE MODE — when glide happens
• OFF — no glide; pitch jumps instantly.
• LEGATO — glide only between overlapping notes (play legato to slide; lift between notes for an instant new note).
• ALWAYS — glide on every new note, overlapping or not.

GLIDE SCALE — how the time relates to the interval
• OFF (constant time) — the slide always takes the GLIDE time, regardless of how far apart the notes are. A semitone and a two-octave leap take the same time.
• ON (time per octave) — the GLIDE time becomes the time to travel one octave, so total slide = (interval in octaves) × GLIDE time. Close notes glide faster, wide leaps take longer. When ON, the GLIDE readout shows "/oct" to remind you it's per-octave.

Scale-ON examples (GLIDE showing 500 ms/oct):
• 1 semitone ≈ 42 ms
• perfect fifth ≈ 292 ms
• 1 octave = 500 ms
• 2 octaves = 1.0 s

Glide in mono vs poly:
• MONO — glides from the note you were playing to the new one.
• Polyphonic — each new note glides from the pitch of the last note you played.