Comments

Comm. NT: 29.
Rūpakkhandhakathāvaṇṇanā

29. “The question, ‘It is the mode and the alteration of what?,’ should be handled in the same way as for bodily intimation,
with this difference: for ‘next to the apprehension of the appearance of movement’ substitute ‘next to the hearing of an audible sound.’
And here, because of the absence of stiffening, etc., the argument beginning, ‘For it is the air element given rise to by the seventh impulsion’ does not apply;
for the sound arises together with the knocking together,
and the knocking together only applies in the case of the first impulsion, and so on.
The knocking together is the arising of groups of primaries (bhūta-kalāpa) in proximity to each other due to conditions.
The movement is the progression of the successive arising in adjacent locations. This is the difference.
The earth element’s knocking together is parallel to the air element’s moving as regards function” (Vism-mhṭ 452).

пали	Yathā hi araññe ussāpetvā bandhagosīsādiudakanimittaṃ disvā udakamettha atthīti viññāyati, evaṃ kāyavipphandanañceva vacīghosañca gahetvā kāyavacīviññattiyopi viññāyanti.
Nyanamoli thera	For, just as, on seeing a sign for water consisting of an ox skull, etc., hung up in the forest, it is intimated that “there is water here,” so too, on noticing either the bodily shaking or the voice in speech thus, they intimate. 29 (See Dhs §637.)