BACKGROUND
I am new to the forum and inexperienced.

I have a project where I am trying to make a musical instrument and want to send sensor data to a non-powered speaker. There will be 30 separate sensors (piezos).

I have a Teensy 3.5, pjrc audio shield and pjrc prop shield.

My understanding is that the audio shield will help provide audio support and sound files and the prop shield will provide amplified output.

QUESTIONS
Can I connect and solder BOTH the audio shield and prop shield to the Teensy 3.5 or will that mess things up?

Is there a better way to make my project?