You can change GUI refresh time by changing gui/qtV2/refreshtime. The time is given in ms.
Default is 60 milliseconds.
GUI latency doesn't affect directly sound card latency. However, a low latency consumn more power and
may give the software inusable.
If a too high latency is setting, then realtime timer (like sound playing time, waveform) may not
enough accurate and software will become inusable also.
A time between 30/80 milliseconds are right value depending your CPU.
For checking right value, you may load a mp3 file into all turntables and look for latency/cpu power.
For changing vumeter fall time, you can setup parameter gui/qtV2/vumeter/fall. Default value is 0.3
Higher value is, higher speed vuleds will turn off
This variable setup period for sync led blinking on hardware DJ Turntable.
For example:
Itsetup the period time that turntable sync led is on each beat. Default is turn on synch led on each beat for 50% of beat.