Since, I am finding the 4 accents confusing, so is there a way that the app only beeps at the correct strumming time instead of equally spaced time which it currently does.
Do ---NOT--- do that. That will screw up everything.
You say there are 4 accents. You bar, well a bar of 4/4 should have one accent. Or perhaps A 2 m 4
Accent -- 2 -- mid -- 4 = 1 2 3 4
that beat 3 is often kinda strong but not a full on 1 accent. But your basic metro should be going ONE 2 3 4 or CLICK click click click.
If you used drums you could go...
BASS snare Bass snare
What you are doing is depending on the metronome to keep time for you but in reality you are responsible for playing any given groove or rhythm over that static time.
It is quite possible that many instruments would syncopate beats meaning they all play a different groove over a static beat. If you latch on to any one of them mentally you will no longer be playing your groove/rhythm.
EX: Let's assume 4/4 with simply CLICK click click click.
Now lets say a bongo player is playing 1 (& 2) & (3 & ) 4 & -- so he is playing only the non bracket beats. The 1, and of 2, 4 and.
Now let's say a guitar is strumming on 2, &4
Let's say keys were playing 1, 3&
So you have all those guys playing different stuff. Let's just assume it sounds really good. I just made that up. But do you see that if you latch on to any one of them you will simply play what they are playing?
What you want to KNOW is the CLICK click click click. Then you want to superimpose your rhythm on top.
Try this. Count 1 & 2 & 3 & 4 & out loud. Tap you finger to each beat. 8 beats total. 1/8th notes.
Now keep counting but only tap on the &s. Be sure to say ONE the loudest accent. Be sure your finger only lands on the &s. That is now your rhythm & & & &. You should always know where the 1 is.
Now do the same thing and play & &3& &. Now LISTEN to what that sounds like and FEELS like.
Bop BopBopBop Bop --- (1)Bop(2)BopBopBop(4)Bop
Notice the steady clock never changes but once you learn the feel and sound of that pattern you can just keep playing it over the steady clock. When you get more comfortable you will even be able to accent different sections like maybe (1)Bop(2)BOPBopBop(4)Bop -- you see here the & of 2 is accented. Same pattern.
You have to start with the most simple stuff first
Quarters - 4 beats
Eights - 8 beats
Trips - 12 beats
Sixteents - 16 beats
Then start dropping beats out so you are playing grooves over the steady 4/4 metronome.
Don't alter your metronome because you will then try to simply emulate what you are hearing and not make your own rhythm. You always want to be able to find the steady meter of the song because others may play from it in such a manner that they pull you off your rhythm. But your job is to hold your rhythm no matter what. You do this by continually developing your internal clock and recognize rhythmic patterns.
Right now you are stumbling and thus can't HEAR the rhythm. Like riding a bike, you keep crashing before you can get the feel of what actually riding feels like.
You need to get through a pattern a couple times and FEEL / HEAR what it sounds like. If you can't get the whole pattern, get the first half and FEEL/HEAR what that sounds like. Then get the second half... combine. Sometimes you have to cut the metro off to get the pattern. Then cut it back on and align what you just did to the beats.