I would like to design stereo mode dac with PCM1794 which output 5 differential channels. 2*stereo + 1 mono. However I would like to have good volume control for each channel via I2C or spi. Crossing over is done by amplifier but the unfortunately there are no volume control option.
Are there any ICs for it? What can be the solutions for me? I cant simply put potantiometer since I can only reach the hardware via gpios.