Multi-instrument learners struggle to maintain progress in both instruments without regression or inefficient practice schedules

Musicians learning multiple instruments face a critical dilemma: practicing both instruments requires significant time investment, but alternating practice days creates skill decay in the non-practiced instrument and confusion about whether the split schedule actually produces measurable progress. Current solutions (practice apps, generic schedules) don't account for the neurological differences between instruments or provide data-driven feedback on whether alternating schedules are actually effective, leaving learners uncertain if they're wasting time or making real progress.