10.6

1009Logic Pro User Guide
The Virtual Memory tab contains the following preferences:
• Active checkbox: Turns on or off the virtual memory feature in Sampler. With virtual
memory on, only the initial attacks of samples are loaded into RAM; the rest of the
sample streams in real time from the hard drive. If your computer has enough physical
RAM to hold all samples for a project, you can improve performance by deselecting the
Active checkbox. In projects with lots of audio tracks playing and relatively few Sampler
instances, this may affect performance. If the Active checkbox is deselected and there
is insufficient RAM to hold all samples, Sampler swaps data to and from the disk, which
degrades performance. Deselecting the Active checkbox also increases project load
times.
• Buffer Range pop-up menu: Determines the size of the buffer used for processing audio
samples. You can choose between Small, Medium, and Large buffer sizes.
• Host Disk Activity pop-up menu: Optimizes Sampler by indicating how much recording
and streaming of non-sampler-related audio is occurring. Choose one of the following:
• Less: If your projects consist mostly of software instrument playback, with perhaps a
recorded instrument or vocal or two, set your Host Disk Activity to Less.
• Average: If your projects involve recording a small number of tracks at a time, and
possibly playing back a dozen or so audio tracks and some software instruments, set
your Host Disk Activity to Average.
• Extensive: If you are recording an entire drum kit using over a dozen microphones,
streaming live guitars and bass, recording choirs, and so on, set your Host Disk
Activity to Extensive.
• Requires Constant RAM Allocation Of field: Shows memory requirements of the
parameter settings above. The slower your hard drive and the higher your hard disk
recording activity, the more RAM you may need to allocate to virtual memory. If you
need to apply more, change the amount and click the Apply button.