Appyling DSPs to the corresponding track won’t have any effect. How do I fix that?
If you use hardware synths they produces their own sounds, and Renoise can impossibly add its DSPs to a hardware synth if you run just MIDI, MIDI simply just say which notes to play on the synth, not much more. If you still wants to add internal Renoise effects to your hardware synths you first have to route or record your hardware synths to your computer, and then add effects to the routed or recoreded input.
Btw, hardware synths aren’t that fun any longer, I have six of them, but barely use them anymore. Software synths do the job much better nowadays…
edit: routing is of course a much better solution, didn’t thought about that 
You have to route the signal from your hardware synth back into renoise by adding a Line-In device in Renoise.
Alright, thx everyone!
I’m very new to MIDI stuff so here I come again with dumb newbie question:
in the same song, is it possible to play different sounds out of let’s say the Microkorg without resampling everytime?
Yes, if your synth is multitimbral you can use different midi-channels to control different sounds on your synth. When it comes to Microkorg though, it is a very old synth, and that one is unfortunately not very multitimbral, it can only play two sounds at the same time.
That’s pretty cool. The MK actually has 16 MIDI CH!
Thanks for the tip.
Yes, all MIDI-equipment can make use of 16 MIDI channels, and that is also the maximum number of channels you ever can make use of over one single MIDI cord, so MIDI is in fact pretty limited. But how many sounds that can be played by the device at the same time is sill up to how multitimbral the MIDI-device is, multitimbrality is ofted described in how many number of parts the device can play at once, and as far as I know the MicroKorg has only 2 multitimbral parts, which means it can only play 2 different sounds at the same time, while most synthesizers at least have 8 parts but often more that that…
Another interesting thing is how many voices the device can play, that thing is called polyphony, and that thing tells you how many notes (voices) that can be played at once, independent of which sound you plays.
So lets say that your device have 4 voices polyphony and you make use of for example 2 sounds, but one of those sounds is playing a chord with 4 notes, then all voices are used and you can still not make use of more than that sound even if your device is 2 parts multitimbral. Btw, the MicroKorg has 4 voices polyphony so it is very limited there too, while most synths have atleast 16 voices, but today it is probably most common with 64 voices or more…