Effect 3xx

From Famitracker Wiki

3xx is the effect that enables automatic portamento. It can be used on any channel except DPCM. xx selects the time it takes to sweep from one note to the next; larger values mean shorter sweep time (i.e. faster portamento). 00 disables portamento. It should be noted that any volume envelope does not reset during portamento. For best results, use instruments with constant volume.

Note: 2A03 has a bug that resets the duty phase when switching between certain frequencies. This can be heard as a pop and might be noticable when using vibrato or pitch slides across those frequencies.

Using this effect on the Konami VRC7 chip will eliminate any retriggering of notes.

Example

C-4 00 F ---
D-4 -- - 302
--- -- - ---

C-4 is note, 00 is instrument number, F is volume. Sound will start from C-4 and then pitch will slowly change to D-4.

Example files

 Portamento example — portamento with same instrument and with additional instrument

Effect list

0xy - arpeggio 1xx, 2xx - pitch slides 3xx - portamento 4xy - vibrato 7xy - tremolo Axy - volume slide Bxx - jump to frame Cxx - stop Dxx - skip frame Exx - volume Fxx - speed and tempo Gxx - note delay Hxy, Ixy - hardware sweep Hxx - FDS modulation depth Ixx, Jxx - FDS modulation speed Pxx - fine pitch Qxy, Rxy - note slide Sxx - mute delay Vxx - duty/noise/wave mode Wxx - DPCM sample speed Xxx - DPCM sample retrigger Yxx - DPCM sample offset Zxx - DPCM delta counter