Best mixer

That’s exactly the right way to think about it—once you start hosting other players, the mixer stops being “keyboard hub” and becomes your small band core system.

A Soundcraft Notepad 2x2 is fine for solo setup, but it collapses fast when guests show up. You’re really describing a 5–8 input small-band mixer with growth headroom.

What you actually need for your scenario

You described:

• 1 Yamaha P-125 (stereo)

• 1 KeyLab 61 (likely MIDI → sometimes audio via computer, but let’s assume audio use or future synths)

• 2 Akai MPK Minis (usually MIDI only, so not mixer-critical)

• 2 visiting guitar players (mono each, sometimes stereo effects)

• possibly a mic or two later

Realistically, you want:

• 6–10 inputs minimum

• at least 2 mic preamps

• stereo main outs

• easy physical knobs (not menu diving)

• powered speaker compatibility (your PV15PMs)

Best “sweet spot” mixers for you

1.

Soundcraft Signature 10

Soundcraft Signature 10

This is probably the cleanest upgrade path for you.

Why it fits:

• 4 mic preamps (great for guests + future mic use)

• 2 stereo line channels (perfect for keyboards)

• very clean Soundcraft preamps (good sound, low noise)

• proper EQ section per channel

• solid for small live jams

In your case:

• Piano stereo → channel pair

• Guitar 1 → mono

• Guitar 2 → mono

• spare channels for synths, mic, etc.

This is the “no drama” option.

2.

Yamaha MG10XU

Yamaha MG10XU

This is the most popular “small jam room / rehearsal mixer” in existence.

Why people love it:

• very simple layout (you won’t fight it mid-jam)

• 4 XLR mic inputs

• 2 stereo channels

• built-in effects (reverb for guitars/vocals)

• very reliable

This is the most plug-and-play choice for casual group playing.

3.

Allen & Heath ZED-10

Allen & Heath ZED-10

A step up in “seriousness.”

Why it stands out:

• higher-quality preamps

• very musical EQ (guitarists love it)

• better headroom for dynamic playing

• feels like a “mini live board”

If you want your house setup to feel like a small venue system, this is it.

How it would actually connect (simple version)

For any of the above mixers:

• Yamaha P-125 → stereo line in (2 channels or stereo pair)

• Guitar 1 → mic/line input

• Guitar 2 → mic/line input

• Optional mic → extra XLR channel

Then:

• Mixer Main Out L/R → your PV15PM speakers (XLR or TRS)

One important truth (this saves people money)

Most people overbuy complexity instead of inputs.

What you don’t want:

• tiny “USB podcast mixers”

• 2-input interfaces pretending to be mixers

• digital mixers with app-only control

What you do want:

• physical knobs

• at least 8 real input channels

• simple routing

My blunt recommendation for your exact use

If you want one clean answer:

• Best balanced pick: Yamaha MG10XU

• Cleaner “audiophile-leaning” pick: Soundcraft Signature 10

Either will comfortably handle:

• your current keyboard setup

• 2 guitar guests

• future mic(s)

• and still have room left over

If you want, I can map a physical wiring layout (exact cables from each instrument → mixer → PV15PM) so you can walk into the guitar shop and buy exactly what you need in one trip without guessing.