I've recently updated my Push_Chop device with a new recording and playback engine built on the karma~ external. This includes overdubbing, simultaneous vari-speed recording and playback, and some other improvements. Check out a demo here:
https://www.youtube.com/watch?v=fXB-t6-JIvA
You can download the updated devices here:
http://www.maxforlive.com/library/device/3004/push-chop
Looping/chopping device for Push
Looping/chopping device for Push
-Evan B. sound_designer.composer.performer
http://www.maxforlive.com/profile/user/dataf1ow
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http://www.maxforlive.com/profile/user/dataf1ow
http://www.soundcloud.com/dataf1ow