PION303 OFFICIAL | RTP UPDATE PION303 SETIAP SAAT

pion303Description. The Pioneer SR-303 is an all electronic reverberation amplifier which incorporates an audio-use delay element known as a bucket brade device (BBD).Description. The Pioneer SR-303 is an all electronic reverberation amplifier which incorporates an audio-use delay element known as a bucket brade device (BBD).