
1 - Introduction & Installation
Audio Preferences
E-MU Systems 19
Audio Preferences
Audio Setup
These controls let you set audio quality parameters related to Proteus VX and your
sound card.
Use Optimal Buffer Size
When this box is checked, the Proteus VX will choose the best buffer size based on the
ASIO Buffer Latency setting (located in the ASIO control panel). You should normally
leave this feature enabled for best audio performance. In certain rare cases you may
want to manually set the buffer length to improve MIDI or synth performance.
Warning: Sounds
with long release times
will exhibit “voice
stealing” more than short
percussive sounds.
Buffer Size
This control sets the number of sample periods between updates of the synthesizer
parameters. The buffer size can be adjusted according to the speed of your computer’s
CPU. A faster CPU can handle a lower buffer size. The default buffer size changes with
the latency setting when “Optimal Buffer Size”is checked.
Sample Rate
This control displays the output sample rate of the Proteus VX, and will always match
the sample rate of your sound card. The default setting is 44.1kHz.
CPU Cap
Tip: When running
multiple VSTi’s, distribute
the CPU Cap among the
VSTi’s. Example: If one
VSTi does not glitch at
60%, set the CPU Cap of
two VSTi’s so they add up
to 60%.
This important control sets the percentage of CPU resources that will be used by
Proteus VX and consequently the maximum number of samples that can be played at
the same time. Depending on the design of the preset, a single Proteus VX voice may
contain multiple samples which play simultaneously. The maximum setting is 80%
CPU usage. If you hear notes being “stolen” in your sequence or as you play the
keyboard, or if the disk meter readout at the bottom of the window goes into the red,
increase the value of this control. If you have other applications running, you may
want to reduce the setting of this control to free up more CPU for them.
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