0009459: Routing metronome to audio track causes negative delay (only while using loopback audio drivers) - MantisBT

ID	Project	Category	View Status	Date Submitted	Last Update

0009459	ardour	bugs	public	2023-09-27 07:21	2023-09-30 03:48

Reporter	dspasic	Assigned To
Priority	normal	Severity	minor	Reproducibility	always
Status	new	Resolution	open
Platform	Apple Macintosh	OS	Ventura	OS Version	13.4.2
Product Version	Mixbus 9.x

Summary	0009459: Routing metronome to audio track causes negative delay (only while using loopback audio drivers)
Description	Hi, the idea is to use loopback audio drivers (blackhole or rogue amoeba loopback) to record from many DAWs to Mixbus this works well (i suppose, i haven't tried challenging latency at that path, or - i'm not sure how ito approach at this point) when i route metronome to any audio track (and disconnect from hardware output) and record to track - it always records with negative delay. note: i do not have any hardware ins/outs except headphones plugged into laptop Please let me know how i can further help debugging
Steps To Reproduce	1. Open ardour7/8/Mixbus32c9 2. Use any loopback driver (tested with blackhole and rogue amoeba loopback) 3. create audio track and route metronome to it (while disconnecting metronome from hardware output - to avoid 'no align' indicator) 4. record metronome to audio track 5. it is recorded with negative delay and to confirm the difference: repeat all steps but choose external headphones as audio out this time. 6. now the metronome recording is perfect on the grid
Additional Information	~/Library/Preferences/Ardour7/stdout.log and ~/Library/Preferences/Ardour8/stdout.log do not contain/indicate any timing/delay values please check this topic for initial discussion: https://discourse.ardour.org/t/negative-delay-when-using-audio-loopback-devices/109233/6
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Date Modified	Username	Field	Change
2023-09-27 07:21	dspasic	New Issue