SONY Graphic Equalizer - Model: SRP-E210 - Number of Channels: 2 I purchased this used about 7 or 8 years ago and used it a few times for stage monitoring, after which it was stored in a equipment room. I am selling it because I have no plans to use it in the future. In preparation for listing, I tested the sound output using the PIN input/output. The INPUT LEVEL volume moved smoothly without any scratchiness. There is switching noise when turning the EQ and LCF ON/OFF. I could not confirm any scratchiness on the level volumes for each frequency. As mentioned above, since it has been quite a few years, there may be things I cannot confirm. Therefore, I am selling it as junk, and it is non-refundable and non-returnable. Thank you for your understanding. Please consider purchasing.