some recordings have low volume so the output can be sometimes really quiet. how about we add a volume bar so we can make the output louder/quieter?

I'd like to train this model on 8 V100 GPUs - does it support multi GPU training?

We have to create contributing files for two repositories:

1. cboard-api
2. ccboard

Also, please update cboard's contributing file, in order to:

• Add a list of ways to Contribute .
• Include and describe testing as a way to contribute.
• Include discord channel .
• Include Coding conventions.