FrSky Vario setup OpenTX 2.1

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How to set up the FrSKY high precision variometer in OpenTX 2.1. Spoken altitude, vario tones and ranges, silent center band.
In the change from OpenTX 2.0 to OpenTX 2.1 telemetry handling changed radically. With 2.1 sensors have to be "Discovered" before being available. The idea being you won't have to scroll through all the non existent sensor parameters when programming.
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