MIDI-Keyboard scanner - error in supply / HF decoupling circuit?

[Sinedup]

Common +5V, common ground, decouplers between?
Hi all.
In a distributor's catalogue selling the 510 Scanner IC, (touch-sensitive MIDI), a simplified schematic of a generic (no brand) keyboard controller is added.
Looking at the way the miniature circuit is drawn, it appears that all 20x 0.1uF caps (decouplers) are connected in parallel between +5V (pin 16) and ground, which appears (IMHO) equivalent to one 2uF mini-disc cap.
Is this normal?

The suppied schematic shows +5V bridged commonly to IC pins:
IC1(16&13), IC2(16&6), IC3(16), then IC4>IC19(16&6).
But then it also shows C3>C21 (0.1uF) bridged commonly to ground on one side, the other leg going to all (p16)'s of IC1-IC19.
It then has C22 (0.1uF) again, between IC1(p16) and ground (parallel with original 'circuit listed' C3 in same position).

The E510 IC is apparently discontinued (WWW/Google research), but hopefully I can still find one here (RSA) or get a listed equivalent.
Main question is the 'parallel' decoupling caps & C3-C22 conundrum.
Maybe I'm missing the boat but this puzzles my brain-cell.

Microscopic circuit from components catalogue was abbreviated and re-drawn using Circuit Wizard.
Original Hi-res scan too large for posting (13Mb) & book is probably copyrighted anyway.

 

[Nigel Goodwin]

Looking at the way the miniature circuit is drawn, it appears that all 20x 0.1uF caps (decouplers) are connected in parallel between +5V (pin 16) and ground, which appears (IMHO) equivalent to one 2uF mini-disc cap.
Is this normal?

Yes, you have a separate 0.1uF on each IC, as close as possible to it's supply pins.

You can't use one larger capacitor, because it can't be close to each IC.

 

[Sinedup]

Thanks for prompt reply Nigel Goodwin.
The larger value, 2uF was simply my calculation for 20x parallel 0.1uF caps.
I have 2 synths at home, but keen to build this 'Midi-controller' for the fun-of-it.