# Software controlled COS

**URL:** <https://community.allstarlink.org/t/software-controlled-cos/24949>\
**Category:** AllStarLink\
**Created:** [August 24, 2026, 10:25pm UTC](https://community.allstarlink.org/t/software-controlled-cos/24949 "2026-08-24T22:25:30Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![KR4NZZ](https://community.allstarlink.org/letter_avatar_proxy/v4/letter/k/6f9a4e/32.png) [@KR4NZZ](https://community.allstarlink.org/u/KR4NZZ)\
**Post date:** [August 24, 2026, 10:25pm UTC](https://community.allstarlink.org/t/software-controlled-cos/24949/1 "2026-08-24T22:25:30Z")

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Is there a way to control COS without using phone mode, and without having to modify a CM108 sound card? My idea is to make a radioless node using a stock, unmodified CM108 usb sound card, add your speakers and mic, use the keyboard on a pc for push to talk. Thanks

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**Author:** ![N2DYI](https://community.allstarlink.org/user_avatar/community.allstarlink.org/n2dyi/32/1712_2.png) [@N2DYI](https://community.allstarlink.org/u/N2DYI)\
**Post date:** [August 24, 2026, 11:42pm UTC](https://community.allstarlink.org/t/software-controlled-cos/24949/2 "2026-08-24T23:42:35Z")

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You may wish to look at KC1FSZ's Ampersand-ASL project if you want to use unmodified sound devices (doesn't have to be a CM108 necessarily)  
[https://github.com/Ampersand-ASL](https://github.com/Ampersand-ASL)  
This does require running a web browser on some machine somewhere if you don't have HID PTT/modified CM108. I have used it with Allscan UCI80, UCI120 and UCI200 interfaces with hand mics, haven't really much with other audio devices.

> **···**
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> > On Aug 24, 2026, at 19:25, Clifford Feather [noreply@community.allstarlink.org](mailto:noreply@community.allstarlink.org) wrote:
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> > > ![](https://community.allstarlink.org/letter_avatar_proxy/v4/letter/k/6f9a4e/45.png "KR4NZZ") | [KR4NZZ](https://community.allstarlink.org/u/kr4nzz)  
> > > August 24 |
> > > 
> > > - | - |
> > 
> > Is there a way to control COS without using phone mode, and without having to modify a CM108 sound card? My idea is to make a radioless node using a stock, unmodified CM108 usb sound card, add your speakers and mic, use the keyboard on a pc for push to talk. Thanks
> > 
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**Author:** ![Mike](https://community.allstarlink.org/user_avatar/community.allstarlink.org/mike/32/1569_2.png) [@Mike](https://community.allstarlink.org/u/Mike)\
**Post date:** [November 8, 2026, 4:37pm UTC](https://community.allstarlink.org/t/software-controlled-cos/24949/3 "2026-11-08T16:37:35Z")

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> [@KR4NZZ](#):
>
> Is there a way to control COS without using phone mode

As far as I know, phone mode does not change cos status, just tx/ptt status. Tis why there is no CT when dropping the TX from phone..

Only mentioning it so you think about it better while working on custom build/solutions.

If you are using an older 'PC' with a real parallel port, you can assign/inject COS from there.

All just food for thought. Tough trying to workaround some of the limits sometimes.