For this section we will be setting up Reaper with the Wigware Ambisonics first-order Encoder/Decoder, as per the Tutorial Videos above, to produce compositional examples using alternate 5.1 surround hardware connectivity to illustrate system flexibility, and to demonstrate that surround-sound end-user systems do not have to be exessively expensive to setup.
We will be using a PC WIndows XP computing system running Reaper through an external Creative Labs Sound Blaster Surround 5.1 interface (current price listing from Amazon is £37.10 as of 31/03/08)

through Logitech's X-530 Home Theatre Speaker System (current price listing from Amazon is £42 as of 31/03/08)

The SoundBlaster is connected to the computer via USB and the remaining physical connections are as follows:

The encoder that we will use (WigAmbiEnc_1o.dll) receives a mono audio input and outputs the B-Format channels W,X,Y,Z

EncoderOutput.JPG Enc1o.JPG

The Wigware first-order Ambisonics decoder does not make use of the centre or the LFE (sub) channel of the 5.1 array. The decoder that we will use (WigAmbiDec_1o_GUI.dll) receives the W,X,Y channels (the Z channel is not used in this implemetation) and outputs to the channels Front-Left (FL), Front-Right (FR), Back-Left (BL) and Back-Right (BR).

Decoder.JPG DecGUIIrregular.JPG

The centre channel is not needed for this example but the LFE can be extracted from the B-Format 'W' (omni) channel outputted from the first-order encoder in Reaper.


The arragement of channels on the SoundBlaster is:
Output 1 to Front-Left
Output 2 to Front-Right
Output 3 to Centre
Output 4 to LFE
Output 5 to Back-Left
Output 6 to Back-Right

This is reflected in Reaper's Routing page (note the stereo mapping of channels 1&2 and 5&6, the separate routing of LFE to channel 4 and no mapping for channel 3):


The LFE channel is configured as follows:


The above Reaper file can be downloaded here: