  Haptic interfaces have untapped the sense of touch to assist multimodal music
learning. We have recently seen various improvements of interface design on
tactile feedback and force guidance aiming to make instrument learning more
effective. However, most interfaces are still quite static; they cannot yet
sense the learning progress and adjust the tutoring strategy accordingly. To
solve this problem, we contribute an adaptive haptic interface based on the
latest design of haptic flute. We first adopted a clutch mechanism to enable
the interface to turn on and off the haptic control flexibly in real time. The
interactive tutor is then able to follow human performances and apply the
"teacher force" only when the software instructs so. Finally, we incorporated
the adaptive interface with a step-by-step dynamic learning strategy.
Experimental results showed that dynamic learning dramatically outperforms
static learning, which boosts the learning rate by 45.3% and shrinks the
forgetting chance by 86%.
