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I wonder if I can hook up my Boss Waza Bluetooth headset to this?

There does not appear to be a way to connect the Waza Air headset directly to the BT-DUAL adapter

Is there a possibility to play audio through it from the usb-c or bluetooth?

Yes. The ME-90B supports audio via USB and Bluetooth. Se Pages 12-15 of the ME-90B Reference Manual.
 
A fairly accurate size comparison.

ME50:90B Sizes.png


How much larger is this model compared to the last version?
 
In your opinion, is it worth replacing the zoom b6 with the me 90b? Thanks
Depends what you're looking for I guess.

If you can do without the B6 synths (the m90 has 2 waves, but they are more limited in features than the ones on the B6), prefer dials over a touch screen and care not for the ability to mix and match whatever effect you please, then perhaps.

Then again, from what I've heard so far, the m90 doesn't sound any better or worse than my B6. They're also about the same size and both run fine from my powerbank. Had this been released before I bought my B6, I might have been tempted to buy one. But I see no reason to drop my B6 really. I like the m-90 (been looking for the older version for ages till I got my B6) but I currently have no need for 2 multi-pedals. But, as with everything YMMV.
 
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