Band setup

Your idea actually makes very good practical sense for a band setup. You’re separating things into:

• home studio keyboard (Arturia)

• portable travel keyboard

• band practice keyboard (PSR-330)

• MacBook running the sounds

That’s a common working musician approach.

1. The speaker connection you discovered

When you used a 3.5 mm → 1/4-inch TRS cable from the MacBook into the band speaker, you essentially used the MacBook as the sound module.

Flow:

Keyboard → MIDI → MacBook (Ableton / Arturia sounds)

MacBook headphone out → big speaker

The MacBook headphone jack is stereo, and most PA speakers accept that signal fine.

So that explains the “big quality sound” you heard.

2. Using the PSR-330 at band practice

Your Yamaha PSR-330 can easily act as a MIDI controller.

Connection:

PSR-330 MIDI OUT

      ↓

5-pin MIDI cable

      ↓

USB-MIDI interface

      ↓

MacBook

Then in Ableton Live or Arturia Analog Lab the Yamaha keyboard simply triggers the sounds.

You don’t even need to use the Yamaha’s internal sounds unless you want them.

3. Small travel keyboard idea

A 25–37 key controller is ideal for portability.

Common sizes musicians use:

Keys

Good for

25

backpack size

32

good compromise

37

almost full melodic range

Examples many traveling musicians use:

• Akai MPK Mini Mk3 (25 keys)

• Arturia MiniLab 3 (25 keys)

• Novation Launchkey 37 MK3 (37 keys)

The 37-key size is often the sweet spot if you want to play real lines.

4. Your eventual band setup could look like this

At band practice

PSR-330 → MIDI → MacBook

Travel keyboard → USB → MacBook

MacBook → 3.5mm → 1/4 → PA speaker

Both keyboards can control different sounds simultaneously in Ableton.

Example:

• PSR-330 → organ

• travel keyboard → synth lead

5. One upgrade that would improve sound a lot

Right now you are using the MacBook headphone output.

Eventually you may want a small USB audio interface like:

• Focusrite Scarlett 2i2

Advantages:

• louder output

• cleaner sound

• balanced outputs for PA systems

• less distortion

But what you are doing now works perfectly fine for rehearsal.

✅ One more thing: since you play tennis, piano, and band, there is actually a very clever ultra-portable keyboard that folds and fits in a backpack that some traveling musicians use.

If you want, I can show you three extremely portable keyboards that musicians use with laptops that might fit your situation almost perfectly. 🎹