# How to link controls across multiple instances
**URL:** https://iplug2.discourse.group/t/how-to-link-controls-across-multiple-instances/68
**Category:** Uncategorized
**Created:** [27 April 2020 12:58 UTC](https://iplug2.discourse.group/t/how-to-link-controls-across-multiple-instances/68 "2020-04-27T12:58:32Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@JohnCrosby](https://iplug2.discourse.group/u/JohnCrosby)
#### Post date: [27 April 2020 12:58 UTC](https://iplug2.discourse.group/t/how-to-link-controls-across-multiple-instances/68/1 "2020-04-27T12:58:32Z")
Hi,
is it possible in IPlug2 to link the same parameter across different instances of the same plugin? My goal is to have the same reverb on a couple of tracks, but with different predelay times, and changing RoomSize in one of the plugs would change RoomSize also on the other tracks. I know some DAWs offer this functionality (Reaper has FX-Link) but I would like to have universal solution. I know it is doable: [https://www.bluecataudio.com/Products/Product\_GainSuite/](https://www.bluecataudio.com/Products/Product_GainSuite/) and it makes me wonder if anybody has any idea how to do this in IPlug2?
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### Author:  [@asedev](https://iplug2.discourse.group/u/asedev)
#### Post date: [28 April 2020 07:13 UTC](https://iplug2.discourse.group/t/how-to-link-controls-across-multiple-instances/68/2 "2020-04-28T07:13:26Z")
Search for “shared memory” and “C++”. This should give you some hints. And since most likely it does not have to be synchronized it should be pretty simple to implement.