Thanks for the welcome back, Mark

what are the 4 that you're working on? Natural, Harmonic, Melodic... unless you count Melodic descending as separate. How 'bout Dorian & Phrygian....minor modes of the major scale.

maybe you already know this, but if you learn an A minor pent, then you also know the C major pent. you just play around the C instead of the A. If you know the E minor pent you also know the G major pent. relative minors, yes?

same goes for a blues scale which is just one note added added to the pentatonic.

eg: A minor blues scale is A C D E Eb G a. this has an added b5 to the A minor pent, the Eb note.

C major blues scale: C D E Eb G A c. this has an added b3 to the major pent. it is also the the Eb note, but it is a b3 within the context of a C major blues scale.

...just more inversions, but the pattern is the same over 4 strings for the A min pent/A min blues scale, and the C major pent/C major blues scale. it just depends on where you start and stop and what notes you emphasize.

I play mostly out of patterns over the 4 strings. like most people, I started out learning the minor pents, then the minor blues scales. I then discovered that I had the pattern access to the corresponding Major pents and Major blues scales. which is basically the difference between a natural minor scale and a Major scale. or a minor chord and a major chord. different as night and day, but essential.

I wish someone had just showed me this along with modes very early on, instead of figuring it out mostly by myself. I guess it's my fault tho, as I didn't ask anyone.

if you already know all this, I apologize for being long winded, but perhaps it may benefit someone else.