Preparing WAV Samples for Roland SP-404

The Roland SP-404 series (including the classic SX, A, and MKII) are iconic for their raw, lo-fi aesthetic. While newer models handle stereo WAVs easily off an SD card, converting certain samples to mono before loading them onto your device is essential for the true SP-404 workflow.

$0.99 once · macOS 12 or later

Why Convert SP-404 Samples to Mono?

Even though the SP-404 is a stereo sampler, many beatmakers bounce their core elements to mono. There are good reasons to drop stereo when you do not need it:

Polyphony: The SP-404MKII plays up to 32 voices at once, according to Roland's specifications. They don't say how many voices a stereo sample takes, so check your model's Reference Manual before counting on mono for more voices.
Longer samples in the same space: Roland lists the SP-404MKII's maximum sampling time as 16 minutes, about 185 MB per sample. That size is 16 minutes of 16-bit, 48 kHz stereo. A mono file takes half the space per minute.
SD Card Storage: A mono file uses exactly half the storage size. When you batch convert large drum kits to mono, your SD card holds double the amount of sounds.
Punch and Phase Alignment: A mono kick drum simply hits harder. It cuts through the center of the mix without phase cancellation issues on large sound systems.

The Fastest Way to Convert on macOS

You can batch convert hundreds of drum samples to mono using It's mono, yo!:

Install the lightweight application from the Mac App Store.
Select all your kicks, snares, and hi-hats and drop them into the window.
Set output to your local SSD or directly into the Roland SP-404 SD card's sample folder.
Once converted, your drum hits will be perfectly mono-summed and ready for resampling.

Organizing Your SP-404 SD Card

Keep folders clean: use a "Mono Drum Kit" folder for your percussions.
Use standard 16-bit 44.1kHz WAV formatting for maximum backwards compatibility with classic 404 models. (It's mono, yo! preserves your sample rate automatically).

Convert whole drum libraries to mono in one batch. Try It's mono, yo!

$0.99 once · macOS 12 or later