1. Basic beat may be minim or semibreve. 188

2. When the basis beat is the minim (Gauldin's "slow" tempo), there are two types of measure groups:

a. "3/1" with 6 minim beats per measure in strong/weak alternation. Treatment of dissonance in 3/1 measure is same as in our usual duple or 4/2 measure -- the fifth minim is a strong beat, the sixth a weak beat. 188

b. "3/2" in the modern sense. Treatment of dissonance in 3/2 measure is new -- any beat can be treated as a strong beat -- this is the origin of the hemiola rhythm in baroque music, btw. 188 [I've seen many more examples of Gauldin's "fast" tempo -- see no. 3 below -- than of this "slow" 3/2 tempo -- BUT these fast sections are often notated in 3/2 time in modern editions, so beware.]

3. When the basic beat is the semibreve (Gauldin's "fast" tempo), the texture is usually familiar style. No semibreve passing tones, though -- only minims. Suspensions may occur on the second beat. 190 [In many editions, fast 3/1 sections are notated as 3/2 -- you can usually tell by the prevalent homophonic texture and very small number of dissonances.]