User talk:2409:4072:414:5871:0:0:11C9:D0A1

November 2019
Hello, I'm Spinningspark. I wanted to let you know that one or more of your recent contributions to High-pass filter have been undone because they did not appear constructive. If you would like to experiment, please use the sandbox. If you have any questions, you can ask for assistance at the help desk. Thanks. SpinningSpark 13:31, 22 November 2019 (UTC)