Reference and test tones for the studio
Pure reference and test tones for the studio: confirm tuning, anchor a sub-bass, build sound-design source material, and check your mix against a frequency you can trust.
Open the generatorPlugins and synths give you endless ways to shape sound, but every now and then you need the opposite: a single, known frequency with nothing else attached. A pure sine tone is exactly that. It has no harmonics, no movement, and no character to second-guess, which makes it the most honest reference you can put next to a track.
That neutrality is what makes it useful across the whole workflow. The same clean tone can confirm a sample is in tune, reinforce the fundamental under a kick or bass, give your ears a fixed target during a listening session, or expose a resonant peak in your room. ToneSynth runs in a browser tab next to your DAW, so the reference is always a click away without loading a plugin or printing a region.
Pick A4 at 440, 442, 443, or 432 Hz and check a sample or synth against a stable reference.
Dial an exact low frequency to reinforce a bass fundamental that translates on small speakers.
Learn the sound of specific frequencies so your EQ and mix moves get faster and more deliberate.
Keep the generator open in a second tab and reach for it whenever you need a reference. Here are the moves that come up most in a session.
For interval and tuning experiments, the dual-tone mode plays a second oscillator at the same time, so you can stack an octave or a fifth and hear how two pitches lock together before committing the idea in your project.
A handful of frequencies come up constantly in production. Keeping them in mind makes the tone generator a faster reference.
A sine wave is a single frequency with no harmonics, so it gives you an unambiguous reference. That makes it ideal for checking tuning, reinforcing a sub-bass fundamental, training your ear to recognize specific frequencies, and verifying that a part sits exactly where you think it does in the spectrum.
Match the sine to the musical note your bass is playing. A low E1 is 41.2 Hz, A1 is 55 Hz, and C2 is 65.41 Hz. Type the exact frequency into ToneSynth's number box, confirm the nearest-note readout, then tune your sub layer to the same pitch so it locks with the rest of the low end instead of clashing.
Yes. Play a known frequency such as 1 kHz, listen closely, then try to find it again later by ear before checking the readout. Repeating this with frequencies across the spectrum builds the kind of frequency recognition that makes EQ decisions faster and more deliberate.
Use ToneSynth's sweep mode with the Full Range 20 Hz to 20 kHz preset, or the Sub-Bass 20 to 200 Hz preset for the low end. Listen at a moderate volume for frequencies that jump out louder or vanish entirely. Those peaks and dips reveal room modes and speaker limits that color every mix decision you make.
Reference tones are only as honest as what you play them through. A flat pair of headphones and a clean interface keep your decisions grounded:
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Open the generator, pick a frequency, and put an honest tone next to your track.
Open the generatorA steady reference pitch
Test tones for mixing and more
How pitch and harmonics work