Add a fade rate of 44Hz

[docsteer]

To make the program useful as a test tool, a fade driven at the max fade rate of 44Hz would be useful to have single packet ticks of one level increment

[marcusbirkin]

It appears that the effect engine output is actually unable to maintain the rates currently prescribed. E.g. Setting 25Hz results in about 20-21Hz output 50Hz results in 32Hz

[marcusbirkin]

Very likely that incorrect mainaining of rates is resolved by #196