How to get a real-sounding bass track without a bass guitar
The situation: riffs written, guitars tracked, mix sounds weirdly small, and the reason is the bass-shaped hole where a rhythm section should be. You don't own a bass. Your options, roughly in order of how often people try them: borrow or buy one, program it in MIDI, octave-pedal it, pitch-shift your guitar DI down, or run the DI through a guitar-to-bass converter. They all work to different degrees; here's the honest rundown, with audio at the end so you can judge with your ears.
First, why you can't just skip it
Distorted guitars feel huge in isolation and thin in a mix, because most of their weight is an illusion — the low end you think you're hearing from a high-gain guitar is mostly midrange. The bass supplies the actual foundation, and it also glues kick to guitars. Mute the bass on any produced metal track and the guitars deflate instantly. So "I'll just make the guitars bigger" isn't an option; something has to live down there.
The honest first answer: get a bass
If there's any way to borrow a bass for a weekend or grab a used one for the price of a plugin or two, that's a legitimate answer and I'm not going to pretend otherwise. The catches are real, though: a cheap bass with dead strings and bad intonation recorded by someone who doesn't play bass can easily sound worse than a good fake. Bass is its own instrument — right-hand consistency and muting technique take time you may not want to spend mid-project. If you go this route, fresh strings and a proper setup matter more than the bass itself.
MIDI and sampled bass
Sampled basses sound expensive and record labels have shipped plenty of them. The problem isn't tone, it's feel: the samples follow your grid, not your picking hand, so against fast riffing the low end can feel like it was mailed in separately — because it was. Making programmed bass lock with performed guitars means programming every accent, slide, and palm-mute by hand. Doable, genuinely tedious, and the tedium scales with exactly the kind of busy riffing that needs the lock most.
Octave pedals and pitch shifters
The octave-down pedal (or plugin) generates a synthesized sub tone: fine for doom drones and sludgy single-note lines, glitchy on chords and fast alternate picking, and it never stops sounding like an effect. Pitch-shifting the DI down an octave is a step better — it's your actual performance transposed — but the transients smear in the shift and the result reads as "guitar, but low" rather than "bass." Run it into a bass amp sim and carve at it and you can get a demo-worthy result. It's the best zero-extra-cost option, and it's also where most people land right before deciding it isn't quite good enough.
Guitar-to-bass conversion
Full disclosure, this is the category I have a horse in: I make Basalt, and this entire article is obviously adjacent to it. The idea is different from pitch-shifting: instead of transposing the audio, it rebuilds a bass instrument from your DI — keeping your actual pick attack and timing (which is why the low end locks with the riff: it is the riff) while replacing the guitar's body with a bass's. Not pitch-to-MIDI, not a synth patch. Whether it clears your bar is an ears question, so instead of adjectives, here's the level-matched comparison — same mix with real bass, no bass, and Basalt doing the bass:
Level-matched A/B — real bass vs no bass vs Basalt
No bass guitar in this one. The bass is the electric guitar DI, converted by Basalt.
Mixing fake bass so it reads as real
Whichever route you take, the mix moves are the same and they do half the work. High-pass the guitars (usually 80–100 Hz) so the bass owns the bottom. Keep the low end mono. Add some drive or grit to the bass — a clean sub under distorted guitars sounds detached; a slightly dirty bass welds to them. And resist the urge to pile on sub: the note fundamental matters less than the 700–1200 Hz grind where the ear actually tracks the bassline. If the bass disappears on small speakers, the fix is mids, not more low end.
FAQ
Can I just pitch-shift my guitar down an octave for bass?
You can, and it half-works: the notes are right but the attack smears and the tone still reads as "low guitar" rather than bass. A pitch-shifted DI into a bass amp sim is a serviceable demo move; for a release it usually needs enough surgery that dedicated tools or a real bass win.
Is MIDI or sampled bass good enough for metal?
For some genres, absolutely — plenty of released metal uses sampled bass. The weakness is feel: programmed bass follows the grid, not your picking hand, so fast riffs can feel detached from the guitars. It also takes real programming effort to fake pick attack and dynamics.
What is the difference between an octave pedal and a pitch shifter for this?
An octave pedal generates a synthesized tone an octave down and tends to glitch on chords and fast picking. A pitch shifter transposes the actual signal, keeping more of the performance but smearing transients. Both get you low notes; neither convincingly gets you a bass guitar.
Will listeners actually notice fake bass?
Most listeners will not consciously notice a well-mixed fake — but they notice when the low end is missing or when bass and guitars do not lock. The bar is not "sounds like a vintage P-bass under a microscope," it is "the mix feels full and the riff hits." Lock and low end matter more than authenticity.
I only have guitar gear — what signal chain should I use for bass?
Record a clean DI (interface input, no amp), then do everything in the box: your conversion or pitch tool of choice, then a bass amp sim, then mixing. Do not mic a guitar cab for bass duties — guitar speakers roll off exactly the low end you are trying to create.
The converter from the demo: Basalt — $59, free demo, Windows VST3. Related: how to double-track guitars.