Is there a way to loop several patterns or always start from a particular pattern and continue on to the end when Start is pressed? From the documentation, seems that only one pattern can be looped.
http://tutorials.renoise.com/wiki/Transport_Panel
Toggle pattern looping, which constantly repeats the current pattern.
do that from the Pattern Matrix. see the little rectangular blocks in between the play-button and the yellow number? you can click+drag on those to activate multiple, and Renoise will loop that section.

Thanks for pointing this out and including the screenshot. I found it documented in the manual here.
http://tutorials.renoise.com/wiki/Pattern_Sequencer#Looping_Patterns
“Using the column to the immediate left of the pattern numbers, you can cause a pattern or sequence of patterns to loop. Left-click and drag in this column to indicate the patterns you want to loop. To remove a loop just click on a single slot twice.”
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glad i could help.