Is it possible to make a fade in from a certain volume in SONAR Home Studio 6?
 
At the moment, my fade in is a standard linear fade in. It fades in from the bottem left corner, which would be 0% volume. I'm wondering if you can fade in from like 15% volume?

Clip fades always start at zero but you could use gain/volume envelopes and construct your own fades. Or you could extend the front of the clip to start the fade earlier before the sound actually starts.

Copy that. Create a volume envelope, and insert several nodes.
Once created, the nodes can be moved freely, and positioned at will.
You also have the choice of fast, slow, and linear curves on fades between nodes.
I don't even use the clip fades, because envelopes give you so much control.
You can also create envelopes to automate any synth parameters that a synth makes available.
You may find this useful in some of the projects you are working on.