flute room was on -4, not on -1 nor -2
Tibiantis Info is a fansite of Tibiantis - 7.4 Open Tibia Server. You will find here a knowledge base, calculators and various statistics.
tibiantis.info
here (this is parsed leaked 7.7 map with some minimap from uknown source but I verified that most of these places existed in past)
In topleft you can see minimap, it's a part of fibula dungeon before revamp, also if you go to -4 with "-" button you would see flute room remains on minimap
this is how flute room looked:
(dont mind orange dot, it's pointer from website)