Is this possible at all?
I don’t want to manually load 10+ presets of various VSTi’s just to continue on a song, which is what I’m doing now : very irritating.
And what about track fx on VSTi’s? Even a simple slide doesn’t work.
Oh and full automation on all VSTi buttons, sliders, …
These things are pretty essential for serious VSTi use imo.
saving VSTi presets:
just save your preset as an RNI file (ReNoise instrument).
track FX on VSTi’s:
they work exactly as with standard samples
full VSTi automation:
every thing that has been made automatable by the VSTi creator can be automated in ReNoise via the VSTAutomationDevice and/or MIDICCdevice.
yes they are.
I realy don’t get this. It shall work to save it with the song, doesn’t that work for you??? That works for me, or am I missunderstanding something here?
No it doesn’t. When I save a song and then load it again, the preset I made gets reset to its original value.
Saving the presets as instruments doesn’t help either, since then I also have to manually load the instruments into the song.
To make it more clear, this is what I did :
Now, when I load the song, the preset is not the one I changed but the default one and I either have to manually load the instrument or load the preset.
So, when I do this with 10 Vsti’s, I have to manually load them all after I’ve loaded the song.
If a VST is not correctly restored, this is not a missing feature, but either a bug in Renoise or a bug of the VST plug.
Which of your VST`s are not recalling the presets correctly ?
btw : In Edirol plugs this is not a bug but a missing feature 
They say (without feeling ashamed) in their manual, that you have to save and reload them manually for every song …
No, with track fx on Vsti’s, I meant eg the slide up command, like so:
E-4 02 … 0115
This doesn’t work, nor any other of these effects.
I see automation works through the VstiAutomationDevice, but only for a maximum of 14 parameters. Or can you access more through a MidiCCDevice?
The Vsti in question is “0xVA-3FM” (0XVA-3FM.dll).
I’m trying it with another one …
Yeah, it works with “Daisy”.
How can such a bug sneak into a Vsti??
yes such commands don’t work with VSTi’s, because of their different way of handling events, which is MIDI based. MIDI hasn’t got a tick-based pitch slide.
Look into ReNoise’s manual: you can use the 91 (on panning column) command to simulate what in a MIDI keyboard would be moving the pitch wheel.
if you need more parameters, just add a new MIDICCDevice to the chain.
Will there ever be midi-command equivalents for all the other effects as well?
YES! 
Thanks!
MIDI is a 20 years old standard so do not expect to see any new commands added to its specification.