This "mini" (not Pro) web site mentions the delay after starting the next track and the busy state.
// MP3 DFPlayer notes: clones, noise, speakers, wrong file plays and no library – Garry's blog
This "mini" (not Pro) web site mentions the delay after starting the next track and the busy state.
// MP3 DFPlayer notes: clones, noise, speakers, wrong file plays and no library – Garry's blog