DC-coupling line out from Teensy Audio Board

[Borogove]

I'm working on a hybrid monophonic synthesizer using the Teensy 3.5 and Teensy Audio Board to produce the oscillator waveform and control signals, which then go to an analog filter and VCA.

I had intended to use one of the two channels of the audio board to produce control voltage for the analog filter cutoff, but I have realized the line outs are AC-coupled and thus unsuitable for relatively slow-changing CV.

I'm considering just removing the AC-coupling caps from my audio board. It looks like the row of 4 passives between the SGTL5000 and the line in/out header are the coupling caps for the inputs and outputs; would there be any particular problem just removing those and replacing them with jumper wires?

The SGTL5000 datasheet implies the headphone outs are DC-coupled, so that might be an alternative as well.

[Guliediztodies]

I use ADAU1701 to try some voltage controlled thing. It works well in my experiment.
On other experiment,
I tried to connect ADAU1701 to teensy and it works with Teensy as slave.
ADAU1701 cheap board was used with teensy 4.0.

[LenSamuelson]

I've been running experiments with PJRC PT8211 audio board (stereo I2S 16-bit DAC) replacing the output capacitors with shorting wires. It works beautifully. Good results from DC up to 500 ksamples/second.

The results are good enough to allow us to move toward an affordable test bench for our 64-channel data acquisition system.