The short answer is no, unfortunately, but here's a little more information as to why.
We enabled Orba to send MIDI over Bluetooth, which is great for sending low latency (<20ms) MIDI messages (notes and other music data). Bluetooth Audio on the other hand (sending audio to speakers or headphones via Bluetooth), requires much more bandwidth and has a much higher latency (>100ms). This means that you'd hear the sound noticeably later than when you touch the instrument, which makes it nearly impossible to play in time, and we want to make sure you never miss a beat.
Let me know if you have any other questions about this.
C Toler