Helm 0.6 is out so I'm digging up this thread!
You can grab the build here: http://tytel.org/helm
There are a lot of changes in this build including performance improvements, a mixer, a third envelope, a graphical keyboard, and bug fixes. I had to make some changes that might (unfortunately) change the sound of patches from 0.5 and earlier. Sorry if that causes you issues but once the 1.0 release comes out all following releases will have better sounds stability. Let me know what you think of the new build!
Also, if you make some sweet patches, I'd love to distribute them with Helm
List of 0.6 changes:
Added a graphical keyboard!
Added third envelope
Reorganized layout and new colors, what do you think?
Replaced oscillator "Mix" parameter with a full oscillator mixer
Added update checking
Added patch changing through MIDI
Added some more patches
Fixed 'zippering' and 'buzzing' with weird buffer sizes and bouncing audio
Fixed portamento still affecting sound when off
Fixed some problems with presets in different DAWs
Fixed automation issues on tempo parameters
Fixed unison phasing at beginning of note
Fixed latency when reverb was enabled
When reopening the plugin GUI, Helm now shows the current patch and folder
JACK MIDI input is now labeled "Helm"
Better starting phases for unison voices
Fixed some other small bugs no one probably (hopefully) noticed