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He would simultaneously control the whammy bar, volume and tone control of the guitar which – with the combination of harmonics, off-fret slide and left-hand inflection – explored an orchestral range of sonic possibilities.

Williams, despite not having turned, gave Davis an A+ for vocal tone, control and character.

Two parts of the electronically aided Spacewalk, explored either side of the interval, suggested Jan Garbarek's echoing-fjord sound, with Sheppard's subtle tone control allowing notes to slowly transform from lustrous beginnings to papery whispers as they receded into air.

He's even had his tone control deactivated: it's just set to full-on, all the time.

The fancy status symbols of the genre� Sanyos or Sonys or JVCs� cost up to $400, but for a mere $55 a box-toter can get a General Electric tape model that comes with a shoulder strap, a 5-in. heavy magnet speaker, an automat ic program advance, a variable tone control, an eight-track cassette player and, of course, great promise: It is called Loudmouth II.