4.32pre8 and 8b Song Position Bug?? (related to Anticipative FX processing)

[keys]

Hi,
4.32pre8 and pre8b seem to have a bug which affects the song position pointer sent to VSTi's... This behaviour is not seen in v4.31.
So, tracks:

Channel Master
..VSTi jamstix V3.5 with separate outs
..JS Out 1 (kick)
..JS Out 2 (snare)
..JS Out 3 etc.

Now with no other FX in any of the channels, the Jamstix GUI shows its playhead is in sync with the reaper host play head. Drum sounds are triggered at the correct places 'in time' - i.e Kick IS heard on the correct beat displayed in Jamstix (and the transport bar).

However, If you enable any FX on any of the output paths (e.g. reComp to the snare on Out 2 or reverb on the master folder) then the Jamstix playhead shows up to 1 beat ahead of the reaper transport. Again drum sounds are triggered at the correct places 'in time' - i.e Kick IS heard on the beat but is displayed in Jamstix as say beat 1.5 and not 1.0.

If you disable the FX on the output route, the playheads synchronise again, so it seems like the song position pointer is not in time with the real playhead (some compensation been added?).

Note: If you insert a track with say ReSynth on it and set that to Record ARM'ed in-between the Master folder track and the Jamstix VSTi track, then the bug goes away....


many thanks,
Paul.

Edit:
Confirmed, the song position presented in Jamstix is ahead of the Reaper play position by the amount set in the 'Anticipative Fx Processing Render Ahead' preferences value.

[keys]

Hmm looks a lot like this bug...
http://forum.cockos.com/showthread.php?t=114741

Keys

[danfuerth]

Reastream still does not send audio to localhost 127.0.0.1 after all this time. still not fixed.

It worked fine in windows XP.

It will not work in Windows 7 or 8 to localhost 127.0.0.1

[gofer]

Does it also happen with Preferences -> Audio -> Buffering: "Anticipative FX processing..." disabled?
Maybe also related:
- Cumulative note preview lag when MIDI track is sent to another track that has any FX inserted (anticipative FX processing buffers cumulate?): http://forum.cockos.com/showpost.php...7&postcount=64

[keys]

@gofer, yes sounds exactly like your issue. Will test on my rig when get back tonight.
Keys.

[keys]

Yes, confirmed, the song position presented in Jamstix is ahead of the Reaper play position by the amount set in the 'Anticipative Fx Processing Render Ahead' preferences value.

Surely this is wrong - or do we just lower/disable it for Jamstix too?

I don't know how to change the title of the thread to indicate its related to Render Value so that the devs see it?

[gofer]

I think the devs are aware already that there are problems. In http://forum.cockos.com/showthread.php?t=115901 Justin says that the anticipative FX processing change (introduced in 4.32pre3) won't be in 4.32 release version because it's not ready for prime time.

Anyway, I'm going to try and add some hint in the thread title to be on the save end

[keys]

Thanks Gofer, good job.