Is there an object that functions like [samphold~] but will pass messages instead of an audio signal? In other words, data is passed from left input to output whenever a control signal reaches 0.

you can put anything into the right inlet of

and then bang the left inlet to release it, is that what you mean? after it will take off the list symbol and return your data to its original state.

i haven't tested this fully but do you mean something like this?

input
|
[== 0]
|
[sel 1]
|

|
|

[samphold~] will pass a float or an audio signal through the left inlet whenever a control signal in the right inlet reaches zero. I am thinking specifically of how it us used in the pd browser with samplers (sampler no doppler). is there an object that could pass different forms of data (messages for example) but only when a control signal reached zero.

You mean an audio rate control signal, right? Maybe [edge~]?

[inlet~] <--control signal
|
[expr $v1<=0]
|
[edge~]
|
| [inlet] <--whatever you want to send through
| |

|