Unfortunately I can not allow more multitracks because it would lead to dropouts on older devices that are still compatible with the current version of Stage Traxx. During crossfades, there are already up to 12 tracks playing (6 for each song). Together with the processing for each track, there is simply no more room to ensure stable playback on older iPads.
I will increase the minimum iOS requirements to iOS13 in about a year and that will rule out some of the slower devices. I will then evaluate if it is possible to increase the track limit.