vStack is a looper application build 100% with Max.
    You can use your audio files or just record live audio in real-time.
    It is designed to easily sync each of the channels in various durations, based on a master metronome.
    It is designed for easy control, and very easy timing syncing across all channels.
    - Sync all loops to a master metronome easy.
    - If your audio file or recording is not perfectly aligned or timed, set start and stop points to the channel.
    - Dynamic creation of loop channels. Delete and create loop channels as you like.
    - Effect sends with pre and post options, pass your audio through Overdrive, Chorus, Delay and Reverb.
    - Pitch shift any channel to match your tone.
    - Toggle every channel's playback by keyboard or MIDI.