06-15-2019, 11:40 AM
So I've been diagnosing the Khadas Tone Board with Moode r5.3 and shooting Tim posts as I do. We've figured out the Hardware Volume Control detection problem. It was due to a blunder in the Khadas XMOS firmware which was inconsistently encoding the USB string descriptors for the interfaces. Tim has adjusted for this behavior in the moOde r5.3.1 update.
The good news? moOde now detects the presence of the KTB's Hardware Volume Control and the MPD config panel offers all three choices for volume control: Hardware, Software, and Disabled.
The not-so good news? The Khadas hardware control function seems to work only for PCM playback. With DSD material, I have either to select Disabled or select Hardware and set moOde's volume at 100 percent. I can then play native DSD and DSD-over-PCM while controlling volume at my amplifier.
This is a Khadas issue, not a moOde issue; it affects that other FOSS RPi music player too. The DAC chip spec sheet says it can do hardware control and Tim tells me it works with his Allo Katana, which uses the same chip.
I've spent a lot of time on the Khadas forum reading all the back posts and then posting about the string descriptor problem. Candidly, I'm not holding my breath until they fix either this problem or solve the DSD hardware control problem. The XMOS controller is well documented and third parties have hacked a bit at the firmware. Perhaps one of the DIYaudio cognoscenti will solve the problems.
Regards,
Kent
The good news? moOde now detects the presence of the KTB's Hardware Volume Control and the MPD config panel offers all three choices for volume control: Hardware, Software, and Disabled.
The not-so good news? The Khadas hardware control function seems to work only for PCM playback. With DSD material, I have either to select Disabled or select Hardware and set moOde's volume at 100 percent. I can then play native DSD and DSD-over-PCM while controlling volume at my amplifier.
This is a Khadas issue, not a moOde issue; it affects that other FOSS RPi music player too. The DAC chip spec sheet says it can do hardware control and Tim tells me it works with his Allo Katana, which uses the same chip.
I've spent a lot of time on the Khadas forum reading all the back posts and then posting about the string descriptor problem. Candidly, I'm not holding my breath until they fix either this problem or solve the DSD hardware control problem. The XMOS controller is well documented and third parties have hacked a bit at the firmware. Perhaps one of the DIYaudio cognoscenti will solve the problems.
Regards,
Kent
