Clarke in his commentary on 1 Cor 13:1 does not mention the idea of waking the gods, but he does show an Aeneid quote which Clarke claims is an instance of a trumpet is being used to scare off demonic creatures (harpies). My own reading of the quote is that it is being used as a call to war against them:
Ergo, ubi delapsae sonitum per curva dedere Littora, dat signum
specula Misenus ab alta AEre cavo: invadunt socii, et nova praelia
tentant, Obscoenas pelagi ferro faedare volucres. AEneid, lib. iii.
Then as the harpies from the hills once more Poured shrieking down,
and crowded round the shore, On his high stand Misenus sounds from far
The brazen trump, the signal of the war. With unaccustomed fight, we
flew to slay The forms obscene, dread monsters of the sea.-Pitt.
Contrary to the ESV, Clarke translates χαλκὸς ἠχῶν (literally brass instrument) as a trumpet, not a gong. He then goes on to quote ancient poetry of martial theme that refers to trumpets by their metal. Brass instruments then, for the ancients, had a martial connotation (a call to war).
Among the Hebrews, of course, the intention of using musical instruments (including trumpets) in temple worship, according to the psalms, was to give glory to God. A secondary purpose was to use them as calls to prayer or signals that a liturgically important moment had arrived. It may be important that temple trumpets were supposed to be of silver.
Concerning 1 K 18:27 when discussing "Peradventure he sleepeth" Clarke says:
Among Asiatic idolaters their gods have different functions to fulfil,
and require sleep and rest. Vishnoo sleeps four months in the year.
Budhoo is represented in his temple as sleep, though his eyes are
open. Vayoo manages the winds; Varoona, the waters; Indra, the clouds,
&c.; and according to many fables in the Pooranas, the gods are often
out on journeys, expeditions,
There is no indication that noise will waken a sleeping pagan deity.
Matthew Henry is silent concerning gongs and cymbals in 1 Cor 13. He is equally unhelpful in 1 K 18, contenting himself to adding his own ridicule to that of Elijah.