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There are a lot of ways from simply inverting one side and summing to fancy formant based masking algorithms in audio suites like Logic, Pro Tools, Audacity (free), etc. LabVIEW wouldn't be my choice for working with audio in this way though. What are you trying to accomplish?
LabVIEW Pro Dev & Measurement Studio Pro (VS Pro) 2019 - Unfortunately now moving back to C#, .NET, Python due to forced change to subscription model by NI. 8^{
LabVIEW does have native sound I/O VIs. In most applications, these can be substituted for the DAQ ones. Give it a try and let us know if you run into issues.
If you want an example of a sound acquisition app using the sound API, check this out.