This was discussed in the Renoise 2.7 Synth Experiment thread. 
Try using curves in the volume envelope to further define a small ‘fadeout’ for each note in the arpeggiated ‘riff’.
If you use curve mode in the pitch envelope, you can mimic ‘glide’ to some extent. Use fast rises at the end of each note for ‘normal’ notes (two points with different values close together) while for ‘glide’ notes space the points further apart.
By having a small repeating riff (say 1 bar long) in the pitch/volume envelopes (maybe with a little glide) and a longer repeating envelope in the cutoff/resonance (say 4 or 8 bars long) you can simply press a single key and ‘insta-acid’ your way to a new song 