Would be great if this problem fixed now. Will report in a few days...Thanks @origiri @adriano93 very much for help in testing and feedback!This is a very difficult bug to catch, partly because of the time it takes to reproduce the problem, but also because it happens irregularly.We tried various things and finally solved this problem by updating XMOS's latest USB library functions.
Thank your guys again.
Upgrade as usual:
Download DFU files from HERE and after unzipping, you'll find two files“LA-QXD1 Maximum Volume with Hardware Control DFU_V410.bin” and “LA-QXD1 Minimum Volume DFU_V400.bin”.
Change log:2020-07-03
Fixed occasional no - output issues.
Notice:
1. "LA-QXD1 Minimum Volume DFU_V400.bin" is default factory firmware version and without hardware volume control;
2. “LA-QXD1 Maximum Volume with Hardware Control DFU_V410.bin” is max volume output firmware with hardware volume control;
Thank you for your support.