AZSlow

Well, TestKnob1 looks good now.

But you are not yet at TestKnob2 (stage 2). Whatever you do anywhere else TestKnob1 (Ch:11 CC:110) controls parameter 2 ("T1 Volume") of the first synth labeled as "Playbeat_A".
It can't control "Playbeat_B" or any other synth, it can't even control the second "Playbeat_A".

To complete the stage 2, you need "reset" the synth names just to "Playbeat" (removing all spaces and '*' for clarity). Then, if you insert several of them, Sonar will call them "Playbeat 1", "Playbeat 2", but it will still report to AZ Controller just "Playbeat". "1" and "2" at the end are instance number, they are not a part of the name!
Once you successfully complete Stage 2, you will really be able to control "Playbeat 1" and "Playbeat 2" (one in a time, switching from the Overview tab).

Stage 3 is defining the button to switch.