i wrote a simple App to interactively change filter settings for DSPs. Currently, it communicates over Bluetooth LE and controls a software-based DSP. This could be easily changed to use the SigmaTCP (or the extended DSPToolkit) protocol.
However, i do not have a DSP enabled Hifiberry board and i cannot test myself. So, my question is, how long does it take, until (e.g. a single biquad or 16 biquads) filters are written to DSP's EEPROM? Does it interrupt the music signal? Clear the filter's history?
E.g. can the filters be updated at a rate of 10 Hz (while changing interactively)?
See screenshots for impressions :)