First test with the Koss Porta Pro on Yamaha Tyros 5 - no problem. The 3,5er snaps clean and stable in operation does not produce any crackling or popping. A noticeable loss of sound quality is not also determine; High-Ender could perhaps get to hear with expensive hardware, but also use any headphones with 3,5er. ;)
If it turns out something else in the long-term operation, the review will if necessary. Adds.
