User Manual-Mac

ManualsBrandsMOTU ManualsAudio Interfaces & SystemsHD192 - 12 Input / 12 Output High Resolution Hard Disc Recording System with PCIe Card for Mac and Windows

MOTU PCI AUDIO CONSOLE

Disabling banks does not affect CueMix DSP

When you disable a bank as shown in Figure 6-4

above, it only affects PCI bus routing to the

computer and your host software. Disabling a bank

here has no effect on CueMix DSP mixing.

Therefore, feel free to disable banks that you don’t

need for your software, even if you are using them

for CueMix DSP live mixing and monitoring.

ENABLE ROUTING

The Enable Routing check box expands the

window to display each individual input and

output pair. Each check box represents the

availability of that input or output pair to audio

software running on your computer. Check the

Enable Input check box to make it available as

inputs to your audio software; check the Enable

Output check box to make the output pair available

to your host software. When a box is checked, the

input or output pair will appear in the input or

output source menus in AudioDesk, Digital

Performer or other host audio application. When it

is unchecked, it won’t. But as described above,

unchecking inputs has no effect on CueMix DSP

mixing and monitoring.

Figure 6-5: Check the ‘Enable Routing’ check box (circled above) to

expand the window. You can then disable (or enable) individual input

and output pairs.

☛ Remember: ADAT and TDIF banks show four

channels (instead of eight) at sample rates higher

than 48 kHz.

PCI USE

Enabled banks (or individual inputs and outputs)

take up a small portion of your computer’s

processing power. And while the amount is quite

small for individual I/O pairs, a core PCI-424

system lets you enable up to 24 inputs and outputs

at a time (a total of 48). An expanded PCI-424

system with four interfaces lets you enable up to 96

inputs and outputs at a time (a total of 192). To

conserve your computer’s processing power, only

enable banks (or individual inputs and outputs)

when you are actually using them. Otherwise, leave

them unchecked.

Figure 6-6: Keep an eye on the PCI bus resources when using two or

more audio interfaces.

The PCI Use status display tells you the

approximate PCI bandwidth being used by the

PCI-424 card for the currently enabled inputs and

outputs. This display is mostly intended for

expanded PCI-424 systems, which push the limits

of the PCI bus itself. A higher number will alert you

that there are a signiﬁcant number of inputs and

outputs enabled, perhaps including the ones you

are not currently viewing.

While the theoretical maximum PCI bandwidth is

132 MB per second, there are no hard and fast rules

for how much bandwidth is actually available on

any given computer. Many factors come in to play,

including the efﬁciency of the bridge chip that

controls the PCI bus and the number of other PCI

devices on the bus competing for bandwidth.

Practically speaking, most of today’s personal