Recording audio with Bandicam is simple. Remember the audio from the SDR (which I referred to as direct from the SDR) is always on VAC1, assuming you followed the UMA.
Any application needing audio input is set to VAC 1. Therefore:
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In Bandicam to record the SDR audio direct while also recording the screen, set VAC 1 as the recording input.
In Bandicam to record transmit audio, the setting will depend on how you do this. I avoid sound cards and keep it all in software. As with the digital voice keyer, adjust gain in software to avoid distortion in the recording.
To the question about alternatives, yes there are several. Use 'Google'!
Erik.