Mixer/volume control for NetBSD audio that runs in your terminal.
devel/cdk- used for rendering e.g. slider controls
Q: Could it be made to run on Solaris?
I don't think so. While NetBSD's audio API is based on that of Solaris, they've evolved separately, and I believe the mixer API is incompatible.
Q: What's dacsel?
It allows you to select the primary port. For example, on a laptop, it can control whether audio is exclusively output to speakers, headphones, or both.
Q: How do I control USB audio volume, or a secondary sound card?
Your device is likely available as a secondary mixer device - try
aiomixer -d /dev/mixer1