David-

My preferred method for selecting notes in the PRV is to use the mouse to lasso the blobs in the track. There are other ways, but that's the way I do it.

Yes, you do get that circle-with-a-line through it icon with the mute tool. When you hover the pointer in the right place over a MIDI note's "blob" (not the keyboard to the left, the actual note blob itself) it changes and you can then click on the note which should mute all currently selected notes.

As for the step sequencer, all I can say is that when I select a bunch of SS clips in track view and open the SS by right-clicking on one of them and selecting view/step sequencer, muting a row in the SS view that pops up mutes the same row in all the clips. At least, I crwated half a dozen clips and tried it and it worked.

To be honest though the best way to get what you want is to use the internal mixer in the drum synth/sampler to mute all but one drum, bounce it to a track and repeat as necessary. I haven't got SI drums installed though, so I can't confirm if that's possible or not.

I tried using your technique again. No matter what I tried I didnt get any other symbol then the "no symbol" and wasn't able to mute any notes. I think I tried everything. I increased the size of the squares all the way up but no luck. Why is this working for you and not me?
 
The only option I thought of was to highlight the drums I didnt want...push delete...bounce drums leftover to audio track...copy/past audio track in "drumdump" file for storage...undo my steps in original file to get back the drums I deleted....then copy and paste drum audio from "drumdump" file back into original file. Whole lotta work for what seems like it should be easy.
 
I'm not really sure what the "split track" option does. When I do that I get a new track that is just open space...not even silence. When I insert SI-DRUM the only box checked is "Simple Instrument" in the left-hand column. Is this causing some issue?

Would it work do event filter out all but one drum note at a time and get that to its own track?
 
Bob Bone
 

I fig out a way to make it happen. edit >> filter >> select note i want to bounce and then bounce that note/drum to its own track. and do that for every drum

O, 

david.mivshek.music
I tried using your technique again. No matter what I tried I didnt get any other symbol then the "no symbol" and wasn't able to mute any notes.

 
Sorry, my fault for not explaining properly and I accidentally missed a step out.
 
Before the piano roll view can edit a step sequencer clip the clip first has to be bounced to an "ordinary" MIDI clip. To do this select the clip in track view, right click and choose "bounce to clip" from the menu.
 
Open in the PRV view and you can now edit the MIDI.
 
The thing hat looks like it might be a "stop" or "not possible" symbol is actually the icon showing you've the mute tool selected.
 
Yes, it's confusing. I can only assume there's a reason why the PRV can't directly edit step sequrncer clips. My guess is that the step sequuncer's designed-in limitations are the reason for this.