Merry Scratchmas!

[mccy]

https://www.youtube.com/watch?v=YQ95...ature=youtu.be

www.derknott.de/scratchmas.zip

My Christmaspresent for all!
It's a free VST scratcher (tested in Reaper 32bit)and a standalone scratch EXE.

Martin

[martinvicanek]

Cool device, Martin! I like the inertia of the slider response, well done!
One thing I noticed is that zipper noise that sounds like there is dust on the pickup. I mention this because I encountered a similar phenomenon with my own scrating creation. First I thought linear interpolation was not good enough so I tried higher order, however the noise persisted. I finally tracked it down: it was a numerical issue, the result of adding to a large number (the song position) a small number (the scratching back and forth modulation). The effect was a lack of resolution, making the read index advance in audible steps, hence the zipper noise. I wonder if this could be the case with your schematic, too?

[mccy]

Martin, thanks, I bet yes, but I have no idea how to solve it - I allways built with just trial & error and a bit luck. The noizes were the reason why I added the filter which depends on the slider speed, but that's just a workaround, I guess. I added lots of dezipping, but without success...

Martin

[martinvicanek]

Wanna post your schematic?

[mccy]

viewtopic.php?f=3&t=3746&p=20527&hilit=scratch#p20527

this is an early version... it will take some time to upload the final version...