[Ardour-Dev] option to Disable pop sound at Startup?

[Jörn Nettingsmeier]

Hi Paul,
Thx for your reply. Apologies. I thought the "On Land" gentoo
line was sufficient. Does the pop-sound depend on the platform?
Oh! Is the pop indicating an error?
Ardour5 runs on a couple of machines here,
all up-to-date gentoo linux, running
ALSA <- JACK <- PULSE_AUDIO
Jack is started with qjackctl, which in turn starts pulseaudio
such that it feeds back into jack. Took a while to get right.
Seems to be okay (famous last words) ;)
qjackqtl has post-startup commands to pactl load-module jack-sink. ie.
pactl load-module module-jack-sink channels=22; \
pactl load-module module-jack-source channels=22; \
pacmd set-default-sink jack_out; pacmd set-default-source jack_in
The main system is connected by USB to an RME Fireface UFX (22chan)
It runs in USB CC Mode. http://forum.rme-audio.de/viewtopic.php?id=16845
Further RME details (lsusb and pactl) are attached in textfiles.
Another has an Asus Xonar DG PCI uses the CMI8786 chipset
% lspci -v | grep -A7 -i audio
84:04.0 Multimedia audio controller: C-Media Electronics Inc CMI8788
[Oxygen HD Audio]
Subsystem: ASUSTeK Computer Inc. Device 8521
Flags: bus master, medium devsel, latency 64, IRQ 11 I/O ports
at f000 [size=256]
Capabilities: [c0] Power Management version 2
The kernel module snd-oxygen is used to control the card.
Both systems make a pop-sound when Ardour5 starts.

It's very unlikely that Ardour is to blame for that sound...
You are starting jack before Ardour, with qjackctl? I'm asking because
some interfaces behave badly when they come up (I've seen that with a
few fireware-based ones), but it's strange you're seeing this both with
a pro RME device _and_ a CMI chip.
What could happen is that you are using a session with a badly behaved
plugin. Something that emits a constant DC signal comes to mind -
inaudible during normal operation, but will cause a pop when you connect it.
Or does it happen with a new, empty Ardour session as well?