Recently I've been reviewing quite a few touchscreen controllers for Ableton Live. LTC-1, a new and free controller for Live comprised of a Max for Live device and a Lemur project by DSRT Sound, takes a decidedly different approach. There
The combination of Max for Live MIDI effect and Lemur template in this free arpeggiator is quite clever. FingArp has many functions you can quickly switch between and affect, which gives you tons of immediate variations for your chords. It
The Max for Live effect Clip Sequencer can be really useful for live performance and composition. It allows you to use MIDI clips to sequence incoming played/held MIDI notes or chords from a keyboard or MIDI controller in real time.