If you see red indicators on SEND and RETURN modules in Spat, and the Status bar is indicating dropped sync, then it is most likely to have a mismatch in Frame size or sample rate, or CPU performance is overloading.
Frame size ( sometimes called Buffer Size or Block Size) should be matched in the host DAW and Spat Revolution. If the audio processing is too demanding for your computer at the current block size and sample rate, you may also experience drop outs and sync problems due to CPU overload. If you are experiencing lost sync when using Local Audio:
There are also some performance preferences that may help in the case that your host machine CPU is overloading and causing audio glitches.
To lower graphic frame rates, go to the Spat preferences. Changing the Engine Frame Rate will reduce pressure on the graphics updates and important when a host machine dœs not have dedicated GPU and CPU resource issues.
If you are still experiencing lost sync, then please take a look at the Appendix B of this guide for further troubleshooting tips. Also please read carefully the detailed advice in the Reaper and ProTools quick start guides, section 12 of this guide even if you don’t use those DAW, as some it the advise there might apply to other setups.