Thanks for the tip on ASIO buffer size Mac, I'll give that a try. In regards to midi synth, I'm using the VSC DXi as default, and have the checkbox below checked for this in the midi driver setup window. But in that same window I can't highlight the VSC in the upper righthand box because it does not show up there. The only drivers listed there are Microsoft Midi Mapper and Microsoft GS Wavetable Synth. Shouldn't the VSC also show up there as a selection?

Terry

BIAB/RB 2018 PlusPak. Dell Inspiron23 running Win10, 12GB RAM, 2.5GHz i7, Presonus AudioBox USB interface.