IIRC Bud use beech during fermentation as a throwback to an old way to keep yeast in suspension, rather than a direct flavouring process.
This is different to using wood chips as an alternative to barrel ageing and its worth noting that barrels ofter go through extra processes in their manufacture and use and will give a different flavour to raw wood. Barrels used in beer ageing are often ones discarded from wineries and distilleries.
You have three options.
1) Use chips made from old barrels getting the character of the barrel previous use.
2) Use raw wood.
3) Toast your wood to recreate the desired type of barrel.
Toasting your own Wood Chips by Matt Del Fiacco
https://www.lodiwine.com/blog/Oak-barrels--part-4---Step-by-step-visual-of-how-barrels-are-coopered
https://luxrowdistillers.com/bourbon-barrel-charring-process/
You can also soak the wood in wine, whiskey, bourbon, brandy, rum to give it the character of barrel that has had a previous life.
The first use of wood in a beer will extract the most flavour.
Doing a range of toasts can be interesting. Here's my chunks.
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