FTM provides an extended message box, the ftm.mess. The external is very similar to the Max message box and allows for the use FTM expressions.
As the Max message box one can use place holders for the arguments of incomming messages and lists with $-prefixed indices such as $1, $2, $3, etc.
FTM message boxes can have multiple inlets, whereby the indices correspond to the elements of an incomming list as well as to single values sent to the corresponding inlet.
Lists sent to another than the left most inlet will will be treated with an onset corresponing to the inlet. For example, a list of two elements sent to the third inlet will correspond to the arguments $3 and $4.
The number of inlets of the object corresponds to the maximum index used in its expression. For example an FTM message box simply containing $5 will have 5 inlets. In addition, the number of inlets can be set with the ftm.mess inspector.