Where does “Baßtuba” come from?

Baßtuba (German) comes from German Baß, from Italian basso, from Latin Bassus, from Ancient Greek βάσις, from Proto-Hellenic gʷə́tis, from Proto-Indo-European gʷémtis, from Proto-Indo-European gʷem- — to step.

Ancestry of “Baßtuba”, step by step

Baßtuba traces back through two separate lines of ancestry.

via German Baß

Step	Language	Word	Meaning
1	German	Baß	—
2	Italian	basso	low; short; narrow, thin
3	Latin	Bassus	thick, fat, stumpy, short, low, base
4	Ancient Greek	βάσις	step; rhythm; foot
5	Proto-Hellenic	gʷə́tis	step
6	Proto-Indo-European	gʷémtis	step, act of walking
7	Proto-Indo-European	gʷem-	to step

via German tūba

Step	Language	Word	Meaning
1	German	tūba	tuba wind instrument
2	Italian	Tuba	tuba
3	Latin	tuba	A long trumpet over 1 meter in length; tube

Every word from Proto-Indo-European gʷem- →Every word from Proto-Indo-European gʷémtis →Every word from Proto-Hellenic gʷə́tis →