Kjames
Stage Traxx 3 has a lower volume output compared to other apps
This is intentional so that increases of up to 6db can be applied to audio tracks to help level match without clipping or distortion
To compensate I’ll give you two fixes
In the settings tab
Click master Equalizer
Apply a 6db Gain and toggle it on
Alternatively if you have a digital mixer you can apply an additional 6db on the preamp gain