My set up is RME HDSP 9652 MIDI out to MIDI Solutions powered splitter, which feeds a synths MIDI on channel 1. Now I've noticed that when I set my DAW's buffer size to 128 samples, I can only control on MIDI CC parameter. Anymore than 1 CC parameter over that channel either get wonky, or don't respond at all. If I go up to 256 samples, everything I have the ability to send as many CC parameters as I wish. Why is this? Could the splitter be limiting the amount of parameters I can send, or is it an audio interface limitation?