Hello,
I stumble upon a limit of route. I wish to create a [route ] with no parameter to be able to init the control with a symbol containing the [f $1] value].
Exemple : [route Interface0] or [route Interface1] , created at start , depending on the instance number of the patch

The piece is the following :
[r data]
| 
[t a b]
| |
| [f $1]
| [symbol Interface$1(
[route]

Does anyone have a solution to this?

Thank you

Found solution :
In fact [route] does not accept symbol to its right input if zero argument is given in the block.
But [route foo] accepts a symbol.
Seems that there is a mistake in the documentation;

@JMC64 Yes, you have to give it an argument so that it is defined as a [route float] or [route symbol] as it is created. It defaults to float if no argument is given.
Well done... solving the problem....... on your own in vanilla.

The help for [route] in Pd extended documented this...... and much more..... as [route] can do more than you might think and has some other quirks.....
More here...... route.zip
David.

@Whale-av : Thank you for extr doc.
Indeed the doc in Pd is wrong :

With zero or one argument, route sprouts an inlet to set the argument (which may be float or symbol).

In fact for a symbol, you need to specify the type or a dummy argument. I hope maintainers of Pd may correct it.

@JMC64 [route Interface$1] should also work