Hi guys,
I'm running RuneAudio on my Raspberry Pi 2 connected to USB DAC (Marantz SA KI Perl Lite - equipped with a Cirrus Logic CS4398 DAC) that supports hardware volume control.
I'm able to change the volume using Alsamixer volume control on the RPI2, however in RuneUI, setting the volume control to "enabled - Hardware" in RuneUI translates into changing the volume of the SoC output (bcm2835) rather the volume of the sound card being used. (hence doing nothing to the actual volume)
Is there something to do to "bind" the volume knob to the sound card being actually used?
Also I noticed with the bcm2835, the volume knob value is not a 1-to-1 mapping to the Alsamixer PCM value
RuneUI: 0 -> 2 AlsamixerPCM (dB Gain -102.37dB)
RuneUI: 10 -> 3 Alsamixer PCM (dB Gain -91.73dB)
RuneUI: 20 -> 4 Alsamixer PCM (dB Gain -81.09dB)
RuneUI: 40 -> 9 Alsamixer PCM (dB Gain -59.81dB)
RuneUI: 60 -> 20 Alsamixer PCM (dB Gain -38.54dB)
RuneUI: 80 -> 44 Alsamixer PCM (dB Gain -17.26dB)
RuneUI: 100 -> 100 Alsamixer PCM (dB Gain +4.00dB)
RuneUI is more in a 1 step = 1dB while Alsamixer has a completely different slope. What is the reason behind that?
Thanks !
The Setlaz
