Two letters key combo

[HighArn]

Hi, stuck with this. I just need that when I press K and L at one time the backspace would be pressed. K and L must act normally when pressed separately. I found a few solution that doesn't work well.

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~k & l::
Send {Backspace}
return

This for example sends k with backspace, adding second backspace is not solution for me.
Others scripts that i found for example send backspace only on key release, k and l separately send on release to, this is bad to.

When i used my mechanical programmable keyboard there is a combo keys with qmk, they are based on timings, like one key after pressing wait for another to make combo, and those are worked pretty well for me.

I tried something like this:

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~k::
lDown:=A_TickCount
keywait l
lDuration:=(A_TickCount-lDown)
If (lDuration<112) {
Send {Backspace}


}
Else
Send k
return

~l & k::
kDown:=A_TickCount
keywait k
kDuration:=(A_TickCount-kDown)
If (kDuration<112) {
Send {Backspace}

}
Else
Send l
return

But this more like a draft, because i'm not really familiar with ahk.
May someone help?

[Mod edit: Moved topic to AHK v1 help, based on posted code and posting history. Please use the right subforums going forward!]

[mikeyww]

With custom combinations, the keys are sent upon the release.

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#Requires AutoHotkey v1.1.33
k::k
l::l
k & l::Send `b

[HighArn]

With custom combinations, the keys are sent upon the release.

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#Requires AutoHotkey v1.1.33
k::k
l::l
k & l::Send `b

Thanks, this works better than others that I found. But problem that k send only after release, and something with timings, sometimes l is typed with backspace together. It is possible to do this way:

1) When k is pressed it waits about 100ms for l and produce backspace, else produce k.
2) When l is pressed it waits about 100ms for k and produce backspace, else produce l.

[mikeyww]

You can play around with some things like this.

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#Requires AutoHotkey v1.1.33

~k::
KeyWait l, DT.1
If !ErrorLevel
 Send `b`b`b
Return

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#Requires AutoHotkey v1.1.33
#If GetKeyState("k", "P")
l::Send `b`b
#If

InputHook provides an alternative approach.

[HighArn]

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#Requires AutoHotkey v1.1.33

~k::
KeyWait l, DT.1
If !ErrorLevel
 Send `b`b`b
Return

This help me to find that solution

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$k::
KeyWait l, DT.1
If !ErrorLevel
 Send {Backspace}
else 
send {k}
Return

$l::
KeyWait k, DT.1
If ErrorLevel
send {l}
Return

Works almost perfect for me, with sending only one backspace. Just little play with timings. Thanks!