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SAMPLING CHP. 14
8.
Select the Send request when retrieving samples check box if you want the Sampler Tool to send a request
for the sample to the sampler when you click
Get Sample.
Clearing the
Send request check box requires that the sample transfer be initiated from the sampler, even
after you click
Get Sample. Typically, pressing the appropriate button on the sampler satisfies this request.
9.
Select the Wait for request when sending samples check box if you want the Sampler tool to wait for the
sampler to request the sample transfer before sending the sample, even after you click
Send Sample.
Typically, pressing the appropriate button on the sampler satisfies this request.
Clearing the
Wait for request check box configures the Sampler Tool to send the sample as soon as you
click
Send Sample.
Open loop versus closed loop
Open loop describes a unidirectional communication protocol. When the Open loop check box is selected,
the source transmits all data to the destination without listening for instruction from the destination. The
destination has no control over how the data is sent and cannot ask for information to be repeated. This lack
of feedback makes open-loop transfers prone to error.
If the
Open loop check box is cleared, the communication protocol is referred to as closed loop. A closed loop
allows information to flow in both directions. Using closed-loop transfers, the source sends data in small
packets and the destination, upon receiving the packet, either retains the data or discards the packet and
requests the data to be resent. Using closed-loop protocol, the source does not send the next packet of data
until the destination requests it. This makes closed-loop transfers more reliable than open-loop transfers.
In addition to being less reliable, open-loop transfers are slower than closed-loop transfers, especially when
sending samples using the Sampler Tool. This is due to intentional delays placed between data packets to
compensate for varying sampler speeds. Closed-loop transfers typically guarantee the most efficient timing
between packets.
If possible, avoid using an open loop to receive samples from a sampler. The Sampler Tool cannot control
the flow of data packets and there is a high probability that data will be missed.
Tip:
Open-loop transfers can be useful when you do not have
enough cables to connect both the MIDI input and MIDI
output ports.
The Open Loop check box in the
Sampler Configuration dialog