Pandoras Box Fizzle

OK, this got started over in the mods thread but im moving it over here.

As chords and notes decay I hear a lot of fizzle. I'm using an op07cp from Texas Instruments. I have tried lm308. I'm thinking they are real because they came from Jameco, reputable place. Honestly I've tried every op amp i have that will work.

Chuck D asked if it still fizzled if I removed the h11f1. It does go away. So...I started playing with the r15 value. If I go up to a 10k it pretty well solves the problem, I don't think at the expense of any real toan.

Am I barking up the right tree? Is there a better way? Why does limiting the range of the ldr make a difference?
 
Are you 100% that you got an H11F1 and not an H11L1?
Could try a PC419 like in the original.

That said , R15 should be limiting the brightness of the optocoupler so I'd say you're on the right path
 
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