How to Create Metallic Bass Sounds in Serum

What Makes a Bass Sound Metallic?

Metallic bass sounds are everywhere in modern bass music. That cold, hard, industrial edge cuts through a mix like nothing else. Think of the aggressive mid-range tones in heavy dubstep, the sharp textures in neurofunk, or the grinding metallic growls in riddim. These sounds share common characteristics that you can recreate and customize in Serum once you understand what makes them tick.

The metallic quality comes from specific harmonic relationships, particularly inharmonic overtones. Unlike warm, musical sounds where harmonics are neat multiples of the fundamental frequency, metallic sounds have harmonics that are slightly off from those neat ratios. This is what gives metal its distinctive ring and clang when you hit it, and it is exactly what we want to recreate in our bass patches.

FM Synthesis for Metallic Tones

Frequency Modulation (FM) is your best friend for metallic sounds in Serum. When you modulate one oscillator with another at audio rates, you create sidebands that produce those inharmonic overtones we are after.

Start with OSC A set to a basic sine wave. This is your carrier. Now enable OSC B, also set to a sine wave. Route OSC B to modulate OSC A using the FM knob between the two oscillators. As you turn up the FM amount, you will hear the sound become increasingly complex and metallic.

Tuning the FM Ratio

The relationship between the two oscillators determines the character of the metallic sound. Try these ratios for different flavours. Set OSC B to +7 semitones above OSC A for a harsh, bell-like metallic tone. Try +5 semitones for a slightly softer, more musical metallic quality. For maximum aggression, try non-musical intervals like +1 or +6 semitones. These create the most dissonant, grinding metallic textures.

Fine-tuning by a few cents in either direction adds even more inharmonic content. Do not be afraid to experiment with the fine tune knob on OSC B while the FM is active. Small changes make a big difference to the metallic character.

Using Wavetables for Metallic Texture

Serum wavetables offer another route to metallic sounds. Look for wavetables with sharp, angular shapes. Tables like “Analog_BD_Sin” or “Digital” contain waveforms with lots of high-frequency content that lends itself to metallic textures.

Load a complex wavetable into OSC A and slowly sweep through the wavetable position. Listen for positions that have a hard, edgy quality. These are your starting points. Add a small amount of FM from OSC B to push the sound further into metallic territory.

Warp Modes

Serum warp modes can transform any wavetable into something more metallic. Try FM (From B) warp mode on OSC A, which applies FM synthesis directly as a warp effect. The Sync mode is also excellent for metallic tones because it creates the kind of hard, clipped harmonics that sound like scraping metal.

Bend + and Bend – warp modes push and pull the waveform shape, creating asymmetric harmonics that sound increasingly aggressive and metallic at higher settings.

Filter and Effects Processing

The right filter choice makes or breaks a metallic bass sound. Band-pass filters are particularly useful because they isolate a narrow range of frequencies, emphasizing the metallic resonance while cutting away the low and high extremes.

Try a band-pass filter with moderate resonance (around 40-60%). Sweep the cutoff through the mid-range frequencies (500Hz to 5kHz) and listen for the sweet spots where the sound rings and bites. Automate the filter cutoff with an LFO for moving, evolving metallic textures.

Distortion and Saturation

Add distortion in the Serum FX chain to push the metallic harmonics harder. The “Hard Clip” and “Diode 1” distortion types work well for metallic sounds. They add sharp, aggressive harmonics without getting too muddy. Keep the mix at 30-60% to retain some of the original character underneath.

Stacking two distortion units in series can create extremely aggressive metallic tones. Use a softer saturation first to warm the sound, then follow it with a hard clip to add edge. This two-stage approach gives you more control over the final character.

Modulation for Movement

Static metallic sounds get boring fast. You need movement and variation to keep them interesting in a track. Map an LFO to the FM amount so the metallic intensity rises and falls rhythmically. A rate synced to 1/4 or 1/8 notes creates a pulsing, aggressive effect that works brilliantly in drops.

Assign another LFO to the wavetable position for timbral movement. A slow rate (1/2 or 1 bar) creates subtle evolution, while faster rates create more chaotic, glitchy textures. You can also use envelope followers or velocity mapping to make the metallic quality respond to how hard you play.

The macro system in Serum is perfect for creating one-knob control over metallic intensity. Map FM amount, distortion drive, filter resonance, and wavetable position to a single macro. This gives you a “metallic” knob that takes the sound from clean to absolutely savage with one gesture. The Preset Drive collection includes presets with this kind of thoughtful macro mapping already set up.

Build Your Metallic Bass Arsenal

Metallic bass sounds are some of the most exciting and distinctive textures in bass music. With FM synthesis, wavetable manipulation, and aggressive processing in Serum, you can create everything from subtle metallic sheen to full-on industrial destruction.

Download the Free Serum Taster Pack to explore some professional bass sound starting points. Then head to the Preset Drive shop to find packs loaded with aggressive, metallic bass presets ready for your next production.