I have a Livid Instruments Ohm controller, designed specifically for VJing, but it's basically a MIDI controller that can be used for anything you'd like to use it for. You can use it quite easily with Ableton Live as it's USB plug-and-play. Mine is a beautiful wood and metal version, and it's just fun to touch let alone to use.
Livid recently updated the design of the Ohm and came out with the Ohm64. It's basically similar to mine except that it has a 64 button matrix rather than my 36 button version. What's new here is that I just got an email from Livid which aside from other software update announcements had an oh-by-the-way-here's-our-new-FM-soft-synth section. I've been putting off sending in my Ohm to take advantage of the Ohm Recycling Program, but now I almost have to do it just to have a go at the new synth.
It's called simply OhmSound, and it's a two operator FM synth. Two operators doesn't sound like a lot, but it's not limited to the "traditional" sine waves, you can change the waves to any number of waveshapes, complete with graphical LFO and envelope control of the operator levels as well. Tied to the Ohm64 controller, which lets you use knobs, buttons and sliders to control all the synth parameters, you end up with an easy to use and fun to play with synthesizer.
It's called simply OhmSound, and it's a two operator FM synth. Two operators doesn't sound like a lot, but it's not limited to the "traditional" sine waves, you can change the waves to any number of waveshapes, complete with graphical LFO and envelope control of the operator levels as well. Tied to the Ohm64 controller, which lets you use knobs, buttons and sliders to control all the synth parameters, you end up with an easy to use and fun to play with synthesizer.
It's still in very early development apparently, and, Oh Yeah, they're also working on a sequencer as well!
This is totally cool, as Livid basically created a VJ controller but have now expanded its capabilities via software to turn it into something completely different from the original concept. I can't wait to see what else they come up with.
Update: Lived just posted three videos on the use of OhmSound.