anna What sound-action latency would you expect? And are there latencies between audio channels on the CTAG that exceed 1ms?
The CTAG's codec's filters have a a slightly longer delay than the Bela cape's ones:
Bela ADC: 385µs
Bela DAC: 476µs
CTAG ADC: 479µs
CTAG DAC: 520µs
but because the CTAG runs at higher sampling rate (48kHz vs 44.1kHz), the roundtrip latency due to buffering is slightly shorter for CTAG (8% shorter than Bela, to be precise). So, overall the two latencies are very similar, with any difference between the two being a handful µs at most.