@MrBluePants How would u counter a databook statement saying Gin is 500x sound?
Here you go actually. Found it.
I used a text extractor (so maybe 1 or 2 characters aren't correctly extracted) and then I dumped it on DeepL translator (may not be perfect but it's a good translator).
As you'll see below, it CLEARLY states it's the speed of the clap itself.
It also seems to mention it's "faster than the speed of sound", but afterwards it also acknowledges it was a lie Gin made up to hide how Kamishini no Yari truly works.
Some of this is wonky due to the way I did this and my "obviously UNPARALLELED" knowledge of kanji ofc

But it was fun, just for ***** and giggles.
This is the bottom section of the scan:
かみしにのやり
→「神殺鎗」 が伸縮する速さを、己の手を打
つ速さになずらえる。 驚異の伸縮率が露した
その鋒は、音速を凌駕する速さで一護を狙う。
Kami shin no yari
→
The speed at which the "kamishin-yari" expands and contracts is compared to the speed at which one strikes one's own hand.
The speed at which the "Kami no shinshin no yari The amazing rate of expansion and contraction of the spear is revealed.
The spearhead of the spear aims at Ichigo at a speed that surpasses the speed of sound.
Middle section:
13kmの刀を超速で伸縮させる
ギンは自ら、 延びた刀身の長さを13kmと断言し、
実演までした。 からくらちょう 空座町の高層ビル群を一瞬で真
二つにし、広範囲に渡り高い破壊力を見せ付ける。
で構える。解けば、僅かばかりの長さの刀身。
一瞬で縮んだ かみのやり 神殺鎗」を敢えて顔部の前
A 13-km sword is extended and retracted at super speed.
Ginn himself declared the length of the extended blade to be 13 km,
He even demonstrated it. Karakuracho, the town's skyscrapers were instantly
the skyscrapers of Koraza Town in an instant, demonstrating its high destructive power over a wide area.
The sword is held in the form of a "kara-kura-chou" (a sword with a long blade). The blade is only a fraction of its original length.
The sword blade is only a fraction of its original length, and it shrinks in an instant.
Top section:
しかい
始解状態で刀身が刀百本分延びるため、
"百本差し” の異名を持つ しんそう「神鎗」。ばんかい 卍解
では伸縮の長さ・速さが共に上昇するが、
それは真の能力を隠す囮でもあった。
Shikai (the first opening of a sword)
The sword blade extends for a hundred swords when in the initial state,
The sword is known as the "Hyakubonzashi" (one hundred swords). BANKAI Manjidai
the length and speed of the extension and contraction are both increased.
This is also a decoy to hide his true ability.