How to configure DAC?

Hello I finally got some sound out of my Samplerbox but I think now I might have to change the settings on my DAC or I may need a totally new one. When I turn the system on the sound is very distorted. After switching programs a bunch of times I can sometimes get the piano sample to sound right but 3 out of 4 times the system just ends up freezing and I have to reboot and start the process over.

From what I've read I have to edit the soundbox.py file to configure my DAC. Does anyone have a step-by-step tutorial on how to do this? Do I have to manually reinstall SamplerBox?

Here is how it sounds:
https://soundcloud.com/sounds-for-sculptures/samplerbox-not-sounding-how-it-should

The previous sample was the "Piano" and here is the "Saw"
https://soundcloud.com/sounds-for-sculptures/samplerbox-saw-wave-not-working

Here’s how to edit samplerbox.py:

1 - Read your microSD (with ISO mounted) on Linux computer
2 - Enable write permission using terminal: sudo chmod 777 -R /media/pi/ROOT (in my case)
3 - Modify and save .py script (root/SamplerBox/samplerbox.py)
4 - Disable write permission: sudo chmod 711 -R /media/pi/ROOT