Cassettes, Recorders, and Storing Your Audio
A 
Cassette is the blank medium you record onto, and making one costs six 
Oak Planks, two 
Iron Nugget, and a piece of 
Dried Kelp. That last ingredient is the one players forget, because nothing about a tape suggests seaweed — but the recipe will not complete without it, so dry a kelp block before you sit down to craft.
Crafting the Three Pieces
The whole system rests on three craftable objects, and each one has a different job.
- Cassette — six Oak Planks, two Iron Nugget, one Dried Kelp. This is the recording medium itself. You will want several.
Cassette Holder — four Iron Nugget and four Oak Planks. This is the storage piece, the thing that keeps a pile of tapes from becoming a pile of loose tapes.
Cassette Recorder — seven 
Iron Ingot, one 
Circuit Board, and one 
Redstone Dust. This is the machine that does the actual recording.
Notice how the costs scale. A Cassette is cheap and disposable, built from scraps and a plant. A Cassette Holder is only slightly more expensive, since it trades the Dried Kelp for extra Oak Planks and two more Iron Nugget. The Cassette Recorder is the real investment: seven Iron Ingot is most of an iron ingot stack's worth of raw material, plus a Circuit Board and a Redstone Dust on top.
The Recorder Is the Bottleneck
Because the Cassette Recorder needs a Circuit Board, you cannot start recording until you have the infrastructure to produce one. That single component gates the entire activity. Players who rush into crafting a stack of Cassette before checking their Circuit Board supply end up with a drawer full of blank tapes and nothing to play them into.
The Redstone Dust requirement is trivial by comparison — one dust is a few minutes of mining — but it is worth noting that the recorder is a redstone-adjacent device, not a purely mechanical one.
The seven Iron Ingot are the part you feel. If you are still running stone tools, a Cassette Recorder represents a serious commitment of your iron. Build the recorder first, confirm it works, and only then mass-produce Cassette.
Organizing With the Holder
A Cassette Holder exists because loose Cassette are a storage problem. Four Iron Nugget and four Oak Planks is a small price for consolidating a collection, and the nugget cost is easy to absorb if you are already smelting iron for the recorder — nuggets come from the same material pipeline.
The practical order of operations looks like this:
- Gather Oak Planks in bulk. All three recipes want them, and the Cassette recipe alone eats six per tape.
- Bank Iron Nugget. Two go into each Cassette, four into each Cassette Holder. Nine nuggets make an ingot, so budget accordingly.
- Set aside Dried Kelp specifically for tapes. It has no role in the holder or the recorder, which makes it easy to spend elsewhere by mistake.
- Reserve seven Iron Ingot, a Circuit Board, and a Redstone Dust for the Cassette Recorder before you spend iron on anything else.
A Note on Scale
Nothing in these three recipes scales down. There is no cheaper tape, no bulk-crafting discount, and no substitute for the Dried Kelp in a Cassette. If you plan to record a lot, your limiting factors are Oak Planks and Iron Nugget — both renewable, both tedious in volume.
That makes the Cassette Holder more valuable than its recipe suggests. It is the only piece of the three that does not participate in recording at all; it exists purely so that a collection of Cassette stays usable. Build one early, before the tapes outnumber your ability to find any particular one.
Start with the Cassette Recorder, since it is the hardest of the three to assemble and the only one that cannot be improvised around. Then craft Cassette in batches as your Dried Kelp and Iron Nugget allow, and add a Cassette Holder once you have more tapes than you can comfortably track.
Covers the mod’s in-game guide topics: Cassette Cassette Holder Cassette Recorder