@Joe Bloggs or any dev who's potentially here:
Can you please put a Recently Added music file list option to the official Hiby music app for this device, like the feature seen in the Hiby R3 iterations? That would make this device perfect for me, since I discover and add new songs to my player all the time. And I'm certainly sure I'm not alone in wanting this feature.
Lovely device by the way. I own several IEMs like the original 7HZ Timeless, Aful Performance 5, the original S12, the Hexa, Crinacle Zeros (Blue+ Red), 7HZ Zeros (the $20 cheapies: I And II), but the balanced S12 Pro trumps them all. The headphones themselves are almost end game for me, almost.
I haven't tried the class a amp on the S12 Pros yet, but surprisingly, I prefer the regular sound mode on the R5 with most of my IEMs, since I think treble and detail retrieval takes a slight hit with the class a amp. I do know I'll get roasted for this though. Lol. Not to mention the battery life itself takes a massive hit. But hey, everyone should trust their own ears and are entitled to their own opinions.