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The most you can see of the patterns at a time is when you switch to the Jam page and minimize the piano keyboard with the rightmost button under it
Tap and drag the triangles at the end of the loop marker lines.
Uhm, the point of portamento is exactly to _not_ retrigger the sample. I can confirm that even Impulse Tracker (or any other tracker for that matter) doesn't retrigger the sample when using portamento. Moreover, in the XM format, the sample envelope is reset to the first envelope point when a note is encountered during portamento and in the IT format it is not (unless the "Compatible Gxx" flag is set), so the behaviour you're after can be achieved by using a sample without decay and apply a volume envelope on the sample instead.
Updated.
Not sure how you go about converting that into an eboot file so it may be of limited use. It will run under psplink though, as that's how I ran it.
I'll try to figure something out
Here is a binary I built earlier (in fact, the same one that is shown in the video). You may have to magically convert it to an eboot thing to get it to run, or use PSPLink.
