Persona Digital

Music Studio Technology

Persona Studio


Programming Sounds

Instruments (aka patches, presets, programs, voices) available in my sound modules are samples of real instruments. You can define a voice as a complete sound created with one or more samples with keyboard and velocity mappings, plus programmable synthesizer parameters. Voices can be assigned to a single note on the keyboard, or transposed to a range of keys. A voice response to a key press involves an amplitude envelope that determines how the sound emerges, sustains and decays. An amplitude envelope shapes the sound over time. When a key is pressed, the sound amplitude (volume) starts from zero and moves toward a maximum - this attack contour may have one or more levels and rates. As long as the key is held down, the amplitude is sustained or decays following a second contour. When the key is released the sound amplitude heads toward zero following a third contour. In the Proteus 2500 and the Emulator X3 each contour has two inflection points. When you are programming the amplitude envelope, you enter 6 values for amplitude and six

Synthesis -EMU Patch Design

Below is an EMU diagram showing the synthesis architecture in their P2500 and X3 Emulator. The Voltage Controlled Oscillator has been replaced with sound samples which loop to produce sustained sounds. Samples are digital files. Samples playback through a bank of filters and then an amplifier with envelope and panning controls. A host of variables control each stage of sound production. Amplitude envelopes creates the attack, sustain decay characteristics of an instrument. Low frequency oscillators modulate the amplifier to create effects such as tremolo and vibrato. Filters change the timbres of sound and sweep filters create moving timbres. Filters can be controlled by knobs on the Proteus; by low frequency oscillators, by the keyboard and by foot pedals.




More About Sound Samples

Programming panel from the EMU X3 sampler-synthesizer

This control panel shows the synthesis architecture in the P2500 and X3 Emulator. The Voltage Controlled Oscillator has been replaced with sound samples which loop to produce sustained sounds. Samples are digital files. Samples playback through a bank of filters and then an amplifier with envelope and panning controls. A host of variables control each stage of sound production. Amplitude envelopes create the attack, sustain decay characteristics of an instrument. Low frequency oscillators modulate the amplifier to create effects such as tremolo and vibrato. Filters change the timbres of sound and sweep filters create moving timbres. Filters can be controlled by knobs on the Proteus; by low frequency oscillators, by the keyboard and by foot pedals.


  • Topics presented at Persona Digital Studio are from the book,
    The Sound of Music
    by Stephen Gislason.
    Click the Download button to order the eBook 

  • Persona Mandala

    Persona Digital Studio is located on the Sunshine Coast, Sechelt, British Columbia, Canada.

    Persona Music Recordings: Our Music Catalogue includes recorded performances under the names P2500 Band, Em4U, and the Persona Classical Consort. Some music online is offered to illustrate music history, advance music education and appreciation. The recordings presented online demonstrate Persona Studio's composing, arranging, recording and mastering techniques. All the recordings are completed in house by Stephen Gislason.

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