This is located at: C:\Users\UserName\Documents\Ableton\Third Party Max4Live
for me on Windows. (sorry unsure of the Mac path)
Or you can use the 'Add Folder' link at the bottom of the Places section (Collections panel) and select a folder on your system where you are keeping 3rd party Max 4 Live files (this is my approach).

hi you need max for live installed to be able to use .M4L files, if so , you just have to drag the AMXD plugin in your set

bests

I would just midi-map the play/stop buttons in ableton to a midinote. You could also use an envelope generator to actualy fade in and out. Do this by mapping a send control watcher to the master and subvolumes.

Just arm the midi control learn mode in ableton and send any note or control value from isadora and it will be mapped. (send note with velocity 0 is equal to note off.

Edit: on re-reading your question I am unsure I got it right. Do you want to have each scene remember where in the the same arrangement it left off?

you can set Ableton markers as a starting point right by clicking on it... but that wouldn't solve your problem,...

In Ableton forum they say holding shift and hit space allows pause

but no midi control for that , so you can use midi stroke ( it's a program that emulates keyboard command via midi) and control it via isa note send ;-) 

best solution is often shortcutting, even with keyboard emulator ! the problem is that it requires the Ableton window to be active/ selected to receive the keyboard shortcuts

have fun ! https://forum.ableton.com/view...

Thanks so much! I'm good for send notes from IZZY to Ableton now for start and stop. Is there anyway I can make the score pause instead of stop. My problem is that when I go back to the scene in Izzy I want the score to pick up where I stopped it, and when I hit play it restarts each time. 

Here's how I would proceed: 

1) in isa: menu> communication> midi setup > set output port to "Isadora virtual out"

2) in Ableton open preference panel> midi > input > Isadora virtual out > switch remote button to "on" 

3) then go to menu > option  > set midi affectation (sorry I 'm in French ) or just hit cmd+m ( interface of Ableton goes blue ), click on the "play" button, 

4) go to Isadora and send the note you need to affect to the "play" button, 

5) back in Ableton you should see a little white box with the note number you affected to your button. hit cmd+m to switch midi affectations off.

6) in Isadora send the same note again and you should see Ableton starting

7) then you can go back to 3) and repeat with different buttons in Ableton, changing the notes in Isadora 

in Ableton arrangement view you can create markers in the timeline ( where your mouse is a speaker > right click > add a marker > assign it to a new midi note in isa

(if you need to create a new Ableton timeline marker from Isadora you would need a tool in Max 4 live I think...)

hope this helps!

Bests

@DusX is your man here, as he's the one on the team with the most experience with Ableton. Can you answer this?

(Unless @Skulpture, who is also an expert, is listening and has a handy answer.)

Best Wishes,
Mark