Hi Alex,
I've also responded to your mail, somehow I missed this topic on the forum... But here is my answer again, if anyone has the same question.
Your primary need is possible with both the CueCore1 and CueCore2. However, there are some more limits to the CueCore1 than the CueCore2.
With the CueCore1 you have a limit of 16 tracks, so that would be a maximum of 16 songs. With the CueCore2 that is 128 depending on the length of the song and the amount of lighting fixtures.
Hitting the pad again to stop the song is not really possible I’m afraid. You will just restart the song again, unless it is possible to send a NoteON on the first hit and a NoteOff on the second hit or something, then it is possible.
You can link a lot of things thru the midi connections, depending on what is possible with your Roland SPD SX.
If you have more questions feel free to ask.
Greetings,
Bootsy