Yes, I use it for live and it is perfect.
I use it for soundscapes, granular stuff, loops and triggering of samples.
There are a couple of things I do with the way I set it up, for ease of use and to maximize the CPU.
I save everything as 1 quicksave - I name it “Gig” or whatever place I am playing. I save another duplicate quick save called “Gig Backup”. I have “Gig” quicksave autoload when you power on the machine. The auto load quicksave option is in the system settings. I do not switch quick saves during a set. That could be potential trouble, so I don’t do it.
On a single channel of the er301 I will insert mixers. Each mixer I will call the song name. Each mixer is a track. From left to right, each mixer is the sequence I will play the tracks live. In each mixer I will insert my song stuff per song. Whether it be oscillators / loopers / granular / effects. So each folder mixer will have a complete chain of stuff for 1 song. I then turn off / bypass that mixer/song so the CPU drops back down so I can unbypass the next one. Sometimes I just put a mixer with nothing inside it - a blank - and just name it a track name. These are non er301 tracks and just a way of me remembering a track list instead of writing track names down on paper. I then save that each mixer song as a preset. I do this for all tracks so will end up with say 5 or 6 master mixers - all switched off and bypassed. I then save all that as an autoload quick save + plus another duplicate one as backup.
When it comes to playing i turn on / off each mixer song on the same channel working from left to right.
I used to put 2 mixer tracks on each channel of the er301 and work from left to right then down through the channels from 1 to 4 but it can cause mixups with outputs cables in a live situation, so I now stick to 1 channel. I did this also because I only had 1 available audio channel on my Mix 4 submixer.
Regarding inputs I make sure all the CV inputs match each mixer song so I don’t have to touch any cables once patched. They are already correctly routed in the er301 and I tend to keep everything in the same place, to avoid mistakes. CV things I have hooked up - 2 x attenverter. CV/ Gate from Earthsea. 4 x CV/ 4 x Gates from Teletype. So I’m using 12 inputs. The 2 attenuvertors are important as they are both multi’d and routed internally on the er301 to control multiple parameters / songs. I can tweak them, they change, 16+ different things at once… so I’m not menu digging during the set other than turning mixers on/off.
My sets are not 100% er301, I would say about 40%. What I tend to do is alternate from 1 half of my case, which is regular analog oscillators / sequencer stuff, to the er301 side via a central sub mixer (Mix 4) So as I play one track, I line up the next track and fade between them. The er301 uses 1 channel of that Mix 4 sub mixer.
I am currently working on setting up a 16n fader for the er301 plus those teletype things will be done by i2c also.