Hi Craig.
The Pioneer Receiver plugin can turn on your receiver. Depending on which model you have, you may be able to select the INTERNER RADIO source. The word "TUNER" refers to the broadcast radio receiver (AM/FM). A1, A2, etc. refer to TUNER preset broadcast radio stations, not Internet Radio.
"Set Tuner Frequency" refers to setting the broadcast radio frequency you want to listen to such as 94.9 MHz FM or 1070 kHz AM.
"Select Tuner Preset" refers to selecting a broadcast radio frequency that was previously assigned to a memory preset on the receiver such as A1 , A2, etc.
You won't be able to use the plugin to set presets. You'll need to use the remote control that came with the receiver to do that or the front panel buttons. Honestly, I'm not sure that selecting an internet radio preset will be possible either. I only have a VSX-1021-K for testing which doesn't have the same internet features as current models. You can find all the raw commands for most Pioneer receivers by downloading the Excel spreadsheet for your receiver model or model year at
http://www.pioneerelectronics.com/PUSA/ ... om-Install. You can then use the Send Raw Command action in the Pioneer Receiver actions in Indigo re send the commands needed. It might take some research on your part though.
Hope that helps.