support stereo drumkit for op1 field

[dlarsen5]

new op1 field has stereo 20sec drum kit specs, I've tried on my own to write the aif files but the start/end points aren't correct

[schollz]

Would be great to support field but I don't have a field to test with. Happily accepting PR

[dlarsen5]

I have a field and am very willing to make a PR but stuck on figuring out start/end points haha I'm not sure quantizing to the nearest 8192 blocks are used for the new version format, I followed your blog post about using xxd on the aif file and checking offsets

so this is to say I'm stuck on the last bit otherwise I believe it's mostly the same format except extending the total sample time from 12 to 20 seconds and having stereo 2 channels

[schollz]

Yeah thats the tricky bit! I did a some of trial and error to get it right. Let me know if I can help otherwise

[dlarsen5]

I don't want to take up your time but here is one example file of the new stereo field preset kits if you're curious but will continue to try things

[schollz]

Cool, thanks! I'll take a look.