An alternative solution, which is sometimes more practical, was described in Mike Senior's
Book
Mixing Secrets, and involves constructing a dedicated cable that sums the
outputs from a headphone output to feed the Avantone's input.
Using this special cable you can select the
headphone output, or simply plug the lead into a headphone output to route a summed mono
signal to the Avantone.
hugh
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Technical Editor, Sound On Sound