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Re-uploaded video #4. Youtube claims various audio bands as copyrighted. Don't trust youtube. Assembled DIY 10-channel LED VU audio spectrum analyzer display meter showing operation on desktop playing Youtube videos. Op-amp bandpass filters into LM3915 VU LED bargraph meter. Audio input to meters from computer line-level output. Left side display is audio signal VU meter. Frequency bands: 32, 64, 125, 250, 500, 1.0k, 2.0k, 4.0k, 8.0k, 16kHz. NOTE: Speaker system internally limits audio band to mid-range. Part:PCB-BMAS Documentation and design at Onstate Tech eBay site (http://stores.ebay.ca/onstatetech) Subscribe for technical support. Please read description and product datasheet before comments/questions.