Hi Matthew,
thanks for your question!
It´s not basic at all, no worries.

So, what the numbers mean is the following:
they denote the distance (in semitones) from the base note, that the chord will be built upon.

Let´s give an example, Chord 1: 3,7
When you choose this chord it will build on the base note that´s programmed in the step a chord with 2 notes, one of 3 semitones distance, one with 7 semitones distance, resulting in a minor chord. Lets say your base note is c, then the chord will create a d# (3 semitones distance) and a g (7 semitones distance), which gives c minor as a chord.

You can reference the table on Wikipedia if you want to find out the names of the chords:
https://en.wikipedia.org/wiki/List_of_chords
(column “p.c. #s” corresponds to the Zaquencer notation. In this table, 0 is the base note, which is omitted in the Zaquencer table, t stands for 10 and e for 11)

0: base note only
1: 3,7 Minor chord
2: 4,7 Major chord
3: 3,6 Diminished chord
4: 4,8 Augmented chord
5: 3,6,9 Diminished seventh chord
6: 3,6,10 Tristan chord
7: 3,7,10 Minor seventh chord
8: 3,7,11 Minor major seventh chord
9: 4,6,10 Dominant seventh flat five chord
10: 4,7,9 Major sixth chord
11: 4,7,10 Harmonic seventh chord
12: 4,7,11 Major seventh chord
13: 4,8,10 Augmented seventh chord
14: 4,8,11 Augmented major seventh chord

Best,
Christian