Operation panel for audio processing apparatus and operation method of operation panel for audio processing apparatus

An operation method for an operation panel for an audio processing apparatus, which includes a plurality of operation portions each including a first component including a display with a touch panel, and a second component that includes a plurality of channels each including a plurality of operation controllers including a fader, wherein the touch panel is configured to receive a selection of at least one output channel among a plurality of output channels, and wherein the display presents ON/OFF switching of a link of a first processing parameter, which indicates a send level from an input channel to the at least one selected output channel, and presents ON/OFF switching of a link of a second processing parameter different from the first processing parameter, the operation method comprising:

• receiving, via the touch panel, for at least two operation portions, among the plurality of operation portions, for setting a first link mode and a second link mode independently, wherein:
• the first link mode is for:
• linking the presented the first processing parameter among the at least two operation portions;
• and
• causing the plurality of faders of the plurality of operation portions to receive the send level with respect to the selected output channel, and
• wherein the second link mode is for linking the presentation of the second processing parameter among the at least two operation portions.