Hi, You may remember my queries in November of last year regarding the use of two USB Audio Adaptors with a Raspberry Pi; one to play the chimes and one to play the organ music inside the Wimborne Model Town Minster. At the time it was suggested that I could discriminate between the two adaptors by reading their ID string.
In the event that solution didn't work for two reasons: first the USB Hub in a Pi Zero is a single-TT port and the other is because the two adaptors had the same ID string ;-( At the time we solved this by changing to a Pi 3 which has a (crude) audio jack so I could send the bells to that channel and the music to a USB Audio Adaptor plugged into one of the four available USB Ports. (BTW, the Pi 3 has a multi-TT port). Everything in the garden was lovely until the 12 V (Audio Amp) PSU Brick failed in August and the replacement turned out to be noisy. There was always a bit of a hum loop, but it was acceptable until the extra noisy PSU came along. I managed to obtain a couple of USB Audio Adaptors with a different ID string to the original ones, so I thought that we could revert to plan A. However, I can't work out how to identify the channel from the info available from lsusb, aplay -l and dmesg. I've published the question on the Raspberry Pi Forums at: https://www.raspberrypi.org/forums/viewtopic.php?f=38&t=202382 but there haven't been any responses to date. Anyone here got any ideas? For convenience, I'm working with the two adaptors plugged into my desktop PC (Dell Optiplex), but should be able to transfer the technique to the Pi once I've worked out the trick. (BTW aplay -L gives a lot more info but I couldn't see anything in there to tie the hw: channel to the Adaptor's ID string.) -- Terry Coles -- Next meeting: Bournemouth, Tuesday, 2018-01-09 20:00 Meets, Mailing list, IRC, LinkedIn, ... http://dorset.lug.org.uk/ New thread: mailto:dorset@mailman.lug.org.uk / CHECK IF YOU'RE REPLYING Reporting bugs well: http://goo.gl/4Xue / TO THE LIST OR THE AUTHOR
