Also, if you're only putting the E command in the table it would be better to just make it the instrument's evelope. When you're changing the envelope in a table or in the commands column of a phrase I've noticed it's always clickier than the regular instrument envelope.

The note being quiet enough for you to not hear doesn't mean anything to the CPU.  It just makes that click when you end a note with a K command.

One thing that's always confused me is why, if you put a kill (K) command at the bottom of that table, it can create a loud click, even though the note is completely faded out at that point.

I see! Thanks for that information. I did always notice that whenever the phrase would end, it would do some never-ending delay. That fixed the problem though. This is what I've made just recently: http://chipmusic.org/tybre/music/reggae-tune

One issue I see with the table is that if you don't kill the note, the table will wrap and re-envelope the note. This will cause the note to play again. If you throw a H03 on line 4, it won't.

This is what I did:

The 1+ octave transposition was just to give it a nice "plop" sound.

E00 doesn't actually stop the note playing, so you're probably better off using K commands once you start running complicated tables so you don't overload the CPU

but then if you're not using a brick or pocket you probably don't need to worry about CPU

So I used the E command instead of the K command, and it seems to work better for me. No clicks or anything. I'm working on a track currently, and when its finished I'll post it up for feedback. I think it'll turn out well.

The real questions are these:

What envelopes are giving you trouble?
Are you you using a table to envelope the instrument?
Is the instrument a wav, pulse, or noise?

Please don't fear the E command because of a little clicking. Gameboys were never intended to be used for music production. It's crucial to remember that using the for the aforementioned is like driving a moped on the autobahn.

yep, removing clicks in post = manually selecting the clicks and deleting them, or drawing ridiculously fast volume envelopes to conceal them. not fun!

re: E commands, i've noticed little clicks, but nothing as bad as panning or wave channel stuff. might be different between DMG/CGB/emulator?

Seriously, just avoid using E commands within the chains where possible, I never notice any clicks unless i'm creating an envelope in a table.

It's not as bad as it sounds but it's no picnic.

im pretty sure the envelopes aren't tick based, its using the built into hardware envelope so you have to just use the timing of your note and your ear to finagle something close to rhythmic coincidence.

Oh man, that would be painful!

I have in the past manually removed clicks via Audacity by redrawing segments of the waveform. It's tedious, though.