Hi Vijay -
Ok, I think I've duplicated your scenarioâ€”with the GB song Tempo at the default 120bpm, I imported an audio track [that was originally recorded at 124bpm], then overdubbed a new audio track against it [with the click off, naturally]. Then I went to adjust the song Tempo of 120bpm to match the original track's actual Tempo of 124bpm.
The short answer seems to be to turn off Flex & Follow Tempo on the new track [they should already be off on the imported track] and then manually adjust the song Tempo.
Flex & Follow Tempo are both found in the Edit pane [shortcut â€œEâ€]:
- Select the Track, and in the Track tab in the Edit pane deselect "Enable Flex";
- Select the Region[s], and in the Region tab in the Edit pane deselect "Follow Tempo & Pitch"
This should work. HOWEVERâ€¦if you've done any Region editing in the song, things may still get a bit messy [see below], even though the Regions should now be in sync and at the right Tempo.
If you're interested, a fuller explanation is more than a bit tweaky, so bear with me..
Initially, when I just manually changed the song tempo [without changing any track/region settings] the timing was messed up between the two tracks [which is what I assume happened to you]. GB stamps audiofiles you record in it with the current Tempo [which was 120 in this case, even though I was playing at 124] and turns on Flex & Follow Tempo automatically [found in the Edit paneâ€”shortcut "E"]. But the imported audiofile has no timestamp [since it was not recorded in GB] â€”GB does not [think it] know[s] that file's original Tempo, so it doesn't [can't] automatically enable Flex & Follow Tempo. So when you manually change the song Tempo the new recording and the imported file go out of timeâ€”the new recording is time-shifted but the other track isn't.
If you turn off Flex & Follow Tempo on the new recorded trackâ€”make sure they're already off for the imported trackâ€”then the two tracks should stay in sync when you manually correct the song Tempo. BUT...if you've already cut up either/both of those tracks, apparently the Region start positions will get messed up, and you'll have to fix them manually [apparently the track lock in GB is not the same as in Logic, it's really a Freeze function, and does not help with this, so forget about it]. But if you haven't done any Region editing [cutting up and rearranging] before manually adjusting to the correct song Tempo, then everything should be in sync, after which you can edit more easily.