Led Zeppelin are one of the best-selling music groups in the history of audio recording. The SDK includes tools for facial recognition, gesture recognition, noise cancellation and audio recording. There are many ways for converting an audio recording into a chromagram. Franklin C. Goodale adapted movie film for analog audio recording. Flexible applications include video chat, Web browsing, payment systems, NFC, audio recording etc. Sequencers used for audio recording are called digital audio workstations (or DAWs). The higher speed is necessary because video requires a wider bandwidth than standard audio recording. A MIDI file is not an audio recording. The studio consists of the latest audio recording systems and technology. An audio recording of the performance does survive. The Rivonia Trial was recorded on Dictabelts, a now obsolete audio recording format. "Do it yourself" YouTube series with professional audio recording tips for beginners. The numbers are also read aloud to label the audio recording. Another new feature was the sound technicians' use of a six-channel audio recording system. More sophisticated VCRs offer stereo audio recording and playback.