I've noticed that if I just try to "jam" melody lines on my songs, my pitch is way off because i have nothing to reference too. So what I need to do is compose a melody line, then memorize it so that I know i'm on pitch. i find this annoying because the ideas in my head are hard to specifically get down, it'd be cool if I could somehow just jam the idea, and through some plugin make the pitch perfect, then just practice that as my melody line and then re-sing it.

How do you guys go about doing original melody lines? at the moment i'm singing ideas, and then trying to play them on guitar then compose those in guitar pro (composing program) so that i can memorize and sing them. or do you all have perfect pitch and can just jam out anything with good ptich?

Er, if you're jamming melodies over songs you've already recorded parts for, of course you have a reference, you have the key of the song through the riffs, chords etc. You're working on intervals of that key.

If there's a song playing, I can jam anything on it and that is not perfect pitch, that's just good relative pitch that is essential for a singer! There's a good way to practice it, let a single root note (or chord) play and start singing the same an octave higher. Then start adding notes to create licks. You could do scales if you want instead but licks are far better to work your improv skills. Rinse and repeat until you can feel the intervals automatically.

Learn to play some scales on guitar, not singing exercises, but major and minor scales, pentatonic, blues, etc, and solfege them. I don´t have perfect pitch but most of the scales colors are in my head. Scat singing also works fine.

so when you guys just jam over your songs with your voice, then put up a tuner to check your pitch it's always perfectly green? This is what I'm asking. Your idea about practicing intervals sounds like it'll fix the problem thanks.