Been having issues with Ample Metal Eclipse where a midi made via the built-in riffer of the VST either won't make any sound or sounds completely different. I have tried a trick where you could move the top portion of notes to fix this issue (which supposedly works with FL Studio), but it had no effect. The riffs are pre-made ones (which are default riffs for A Greater Foundation 1 & A Greater Foundation 2, both are presets). I haven't been able to find a solution anywhere else so I thought here would be a good place to ask.
I cant help, but I have been interested in those vst for some time now.
I do hope they work with LMMS.
https://www.youtube.com/watch?v=RYangsRdWMU
Another example of a ample guitar plugin.
https://soundcloud.com/ample-sound/good-times