u-he

hellleutel · Post by **hellleutel** » Tue Jun 19, 2007 11:30 am

hello I like to report something:

i got logic 7.2.3 and i have mfm in a aux bus. now when I change something in the song's tempo map, mfm will produce a loud chirping sound that runs through the delay lines and then it's silent again.
this is the case in stop mode, and i don't have the impresson that it a rest of my audio hanging in some buffer

maybe you already know this or can have a look at it.

best wishes

uli

Urs · Post by **Urs** » Tue Jun 19, 2007 4:06 pm

I'll have a look at it.

Can you try with small buffer sizes? Is there a difference between selected/unselected tracks?

Normally (for a reasonably *slow* ritardando/accelerando) nothing should be audible. The length of the delay lines should just smoothly adjust.

But if the steps are big, i.e. due to long buffer sizes or because they *are* quite large leaps, the delays will speed up/down dramatically. This causes chirps.

If that's the case I might have to add some sort of "inertia" that (optionally!) smoothes delay time changes...

Cheers,

Urs

hellleutel · Post by **hellleutel** » Sat Jun 23, 2007 4:23 pm

hello

i thought I had already replied but I obviously haven't... ok:

this stuff occurs when the sequencer is stopped and I change an entry in the tempo map of a song. So at the moment I have to turn master volume down every time I add change a tempo event (as a film composer you do that a lot) - to avoid heart attacks.

Then afterwards during playback, every tempo change plays without problem. even sudden hard changes, e.g. from 70 bpm to 140 bpm.

The only thing that is maybe unusual here is that I'm working on 48 kHz. Buffer is 256 BTW.

Best wishes

Uli

Urs · Post by **Urs** » Sat Jun 23, 2007 4:37 pm

Hmmm... now, that's interesting... I'll try this in LAP7.2 myself then...

So it happens even though nothing is playing?!?

hellleutel · Post by **hellleutel** » Sun Jun 24, 2007 11:07 am

yeah, also all releases and reverb tailes have decayed.

Krakatau · Post by **Krakatau** » Sun Jun 24, 2007 11:10 am

hellleutel wrote:yeah, also all releases and reverb tailes have decayed.

i didn't read this thread in detail actually, but this seems to be related to synchro in an unwanted circonctance, ...if it's on an accelerated tempo in the case i may be true !

hellleutel · Post by **hellleutel** » Sun Jun 24, 2007 8:31 pm

dear Krakatau i can not allege that I do really understand what you mean...

Krakatau · Post by **Krakatau** » Mon Jun 25, 2007 5:19 am

Sorry

I mean that it could be related to tempo-synchronisation of delay time when reverb tails are shorter at faster tempi

...or just forget it if not right on topic

hellleutel · Post by **hellleutel** » Mon Jun 25, 2007 7:16 am

Krakatau wrote: ...or just forget it if not right on topic

hmm ok, the funny thing was that it occurs when the seq is stopped, and no audio audible, only when editing a tempo in the tempo editor. and (i think) only when mfm is used as send effect in an aux bus.

is there maybe any logic user who can try it out?

i greet you

uli

u-he

KVR Audio

MfM2: ugly chirps when changing tempos in logic