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Summary of Contents for Tiptop Audio VCA
- Page 1 Voltage Controlled Amplifier www.tiptopaudio.com...
- Page 2 The master volume control knob sets the VCA signal output level. It is a post-VCA gain stage which lets you match the VCA out level with other sounds in your system. It is also useful to help compensate for volume di erences between the di erent VCA response shapes.
- Page 3 To hear how the Response Curve Control (SHAPE) knob works patch the following: Patch a slow 10Vp.p Triangle wave from your VCO or LFO into the CV in on the VCA Turn the OFFSET knob o Turn the CV IN knob all the way up till the CV Clip LED flashes. Now slowly turn it back to the point where it stops flashing.
- Page 4 CV is applied. The third is when the VCA is used with a bipolar signal like a LFO. With no o set control, a bipolar signal will open the VCA only during its positive swing.
- Page 5 VCA is one of the most important building blocks in synthesis and is a must have for all but the most simple patches, here are a few examples. Quick Start: Set the SHAPE knob to the center. Patch a sound source into the IN jack.
- Page 6 Dynamic Volume Control (Patch 1): This is the most common use for a VCA and is patched this way in virtually every synthesizer Patch SAW waveform OUT from Z3000 oscillator to Audio IN of a VCA. Set the LEVEL to around 1 o'clock, set SHAPE to logarithmic (left), set the o set to ''o '' (left), set the CV IN attenuator knob to fully open (right).
- Page 7 Filter Frequency Modulation. We will expand on the patch from a previous example. Connect a Sine wave from Z3000 oscillator in LFO mode to the input of a VCA, connect the VCA’s output to the un-attenuated frequency CV input on Forbidden Planet.
- Page 8 Voltage Controlled Audio Modulations (Patch 3): In this patch we will use two Z3000’s, one Z4000 and the VCA to create an FM patch with Index control. Patch the sine wave of VCO1 to your sound system Patch the sine wave of VCO2 into VCA audio in...
- Page 9 Set the mix control on Z-DSP to fully wet (right). Connect Z-DSP OUT 1 to Mix7 IN 2. Set the VCA as follows: LEVEL to 1 o'clock, SHAPE to Logarithmic (left), OFFSET to fully OFF (left), CV IN attenuator to fully OPEN (right).
- Page 10 Connect the output of a VCA to your sound system. Set The VCA as follows: LEVEL at 1 o'clock. SHAPE knob to fully to the left. O set fully to the left. CV IN attenuator fully open, to the right.
- Page 11 CV OFFSET ADJ - TR3: The goal is to keep minimum audio passing from IN to OUT when the VCA OFFSET and CV IN are OFF. This is called the VCA o set. Plug audio into IN, set the LEVEL knob at max, OFFSET fully OFF and CV fully OFF, SHAPE to center. Connect the VCA OUT to your sound system IN and increase the volume on you sound system until you hear the ground noise (hiss).
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