| 摘要 |
An audio playback apparatus (1), an automatic player musical instrument (26) and a voltage controller (2) form an ensemble system for reproducing music tunes in ensemble between the audio playback apparatus (1) and the automatic player musical instrument (26), and the voltage controller (2) is responsive to rotation of a volume control dial (13) so as simultaneously to vary the loudness of electric tones radiated from the audio playback apparatus (1) and the loudness of acoustic tones produced through the automatic player musical instrument (26); when a user rotates the voltage control dial (13), an audio signal (a(t)) and a quasi audio signal (m(t)) are amplified, the audio signal (v'·m(t)) is supplied to the sound system (24) for converting the audio signal (v'·a(t)) to the electric tones, and the quasi audio signal (v' ·m(t)) is demodulated to MIDI music data codes for changing the velocity from the original value to a new value for producing the acoustic tones or electronic tones through automatic playing or composition of waveform data. |
