Hooking up both in one input could weaken the signal for both...
why not just use a small mixer 4 channel with FX for more control of each channel KB, Voc, Guitar, etc,..

Hey thanks guys. It sounds like Russ is saying it's ok.

Well I wanted to keep things as simple as possible. One downside is that my guitar would have to get the same effect as my voice. My guitar - a Yamaha LL-TA has a reverb knob (and can get reverb and chorus without even pluggin in!!).

I guess that I can try the simple setup in a memory care venue, and if it doesn't work, I can get a 4 channel mixer. Since the guitar and the keyboard have effects, I would just need a cheap Rolls 4 channel mixer.

But having to bring and hook up along with the guitar - 1) instrument cable, 2) preamp, 3) preamp a/c adapter, 4) output audio cable for preamp, 5) mixer, 6) output audio cables for the mixer - it sounds like too much. This is addition to my keyboard, stand, mic, speakers, cables, pedals, adapter, etc.

Maybe I'll just play guitar in my room.

Skipping the keyboard is a decent suggestion. I've played guitar for years, but I don't have enough practice performing. I would feel insecure without my keyboard.

I just figured out that I could plug the Hosa Y cable in at the speaker. I usually bring only one speaker to my gigs as the audiences in the senior circuit are usually small. I know that I'm sacrificing the fullness of stereo.

By plugging the guitar and keyboard into the speaker, I can get separate effects for mic and guitar.

Thanks guys. All's well with gigging. I was invited to play for Weight Watchers because they heard that the more I sing, the thinner the crowd becomes.