DAINTYBOOTS'S PROFILE

As the title suggests, I'm trying to make an in-game cellphone.
Right now I have it as a Common Event in the Database.

(not pictured: i do turn switch 0003 off under the "Put Away" option, i was still messing with the script when i took the screenshot haha)

My concern is with the "Play Ringtone" option and there are two problems with it.
1) When I do NOT have another BGM currently playing, it does play the ringtone but I'd like to be able to stop the ringtone prematurely so that it doesn't keep looping if I choose another option.
2) When I DO have another BGM playing, choosing "Play Ringtone" refreshes the current song (eg, playing song1.wav from the beginning instead of playing cutesypirate.wav). I'd like for the BGM to stop while the ringtone is playing and restart again after the cellphone is put away.

I'd also like for "Play Ringtone" to change to "Stop Ringtone" while the tune is playing. How would I go about doing this?

Thank you in advance!

EDIT: added a bit more information for clarity

I want to have a puzzle that opens a door when multiple pressure plates are activated at the same time. I already have the NPC coded to move where I direct it and follow the player on command. I also already have the plates set to activate when the player is standing on them (and I'm pretty sure I can figure out how to turn them off after you walk away).
So my question is: how do I get the pressure plates to activate when the NPC is standing on them?