Very nice and cohesive song with many memorable themes and motifs. I still had it in my ears several days after listening. I predict a place in the top three. :) Good luck!

Welcome to the OSC:) Nice themes and very danceable track. You make great sounds with synth in this trance manner. Good luck in the challenge:) BTW: it is OSC 125, not 121 as you write in the track description ;)

I like the beginning, nice sounds, nice themes. Not a fan of the pitch shifted buildup.

It's a bit of a cliche but a bit of silence between the riser and "drop" really adds a lot of impact

I love your two themes but they feel too separate stylistically. some more work to join the tango with the intro riff might help sell the track as a whole for me.

This sounds great, and is a lot of fun. I like the telephone range drone/texture in the background!

One Synth Challenge #125: T-Force Alpha Plus 2 by Mastrcode Music

Made entirely with sounds from the Odin 2 synthesizer: https://thewavewarden.com/pages/odin-2

All sounds made from init.

Bitwig not 6
Odin2 x ~30
Bitwig FX: Delay+, Filter+, EQ+, Compressor+, Dynamics, Saturator, Tool, Peak Limiter
Other FX: TDR Nova, vladg Limiter no6, Raum, OTT, Cramit, Tape Cassette 2, TAL Reverb 4, kHz haas

z.prime - Steps

All sounds made in u-He Hive2 for KVR's One Synth Challenge #198 (or maybe #200)

Mixture of factory presets, tweaked presets, and made from init.

Oppressively Humid Swamp Ambient

This is a submission for the One Synth Challenge hosted by KVR. I created this in Ableton using only the free software synth Vital

Kevlar Testarossa

The Pipers From The North
By Seap for One Synth Challenge 198, August 2025

Single synth of choice: Kult (Dawesome)

Each autumn, when the heather turned purple on the hills, the bagpipers came down from the highlands. At first, the village children heard only a faint drone, like the earth humming underfoot. They would freeze in their games, eyes wide, and scramble up into the oak trees to see better.

The sound grew, weaving and swelling, until it filled the valley like a storm of music—low drones rolling like thunder, sharp notes flashing like lightning. By the time the pipers emerged from the misted slopes, it was no longer a handful of men but an orchestra carried on the wind itself.

The villagers gathered in silence, listening. Year after year, the same mystery unfolded: a reminder that the mountains still breathed, and that the world above the clouds sent down its song to be heard.

Instruments:
9x   VST3i: Kult (Dawesome)

Effects:a
1x   VST3: A1PrimeDelay (A1AUDIO.de)
1x   VST3: MAnalyzer (MeldaProduction)
1x   VST3: Scaler EQ (Plugin Boutique)
1x   VST3: ValhallaVintageVerb (Valhalla DSP, LLC)
3x   VST3: kHs 3-Band EQ (Kilohearts)
1x   VST: PSP VintageWarmer (x86) (PSPaudioware.com)
2x   VST: ReaControlMIDI (Cockos)
2x   VST: ReaEQ (Cockos)


The Pipers From The North [OSC198]

Made with Synplant for OSC198 no samples just sounddesign!
DAW Reaper 7.43
Instruments:
40x VST3i: Synplant (Sonic Charge) Paid

Effects:
JS: 1175 Compressor
JS: RCInflator 2 (Oxford Edition)
VST3: BLENDEQ (AnalogObsession)
VST3: Cascade (Phonolyth) Paid
VST3: Hyperspace (JMGSound) Paid
VST3: MAnalyzer (MeldaProduction)
VST3: MCompressor (MeldaProduction)
VST3: MConvolutionEZ (MeldaProduction)
VST3: MEqualizer (MeldaProduction)
VST3: MStereoScope (MeldaProduction)
VST3: MStereoSpread (MeldaProduction) Paid
VST3: POORTEC (AnalogObsession)
VST3: kHs Transient Shaper (Kilohearts)

Johnkhf - Scaling the knife-edge ridge

made for the mighty "OSC 200" AKA #198 
#12 Modelonia synth ("The Small Modelonia Orchestra")
-Ableton Live, Ableton Delay, Reverb, Compressor, Equalizers
- 1: ValhallaSuperMassive, 1:  Beat Skillz Max 1

A Tornado Upsets The Grass On The Plain

This Track was made for the kvr OSC challange. It was made using only NI MassiveX for every sound.

Plugins used with number of instances:  
NI MassiveX x30
Shaperbox x20 (cableguys (used only the volumeshaper for sidechaining))
Fabfilter ProQ3 x21
NI Raum x2
kHs Transient Shaper x1
Valhalla Delay x1
Mcompressor x1
SPAN x1
Izotope Ozone 9 (used the maximizer EQ and dynamic EQ modules) x1
4U Project Time x1

DAW: Reaper

Made for KVR-OneSynthChallenge
23xZebraHZ (U-He)
DAW: Logic X
Host Plugins:
ChannelEQ, Compressor, Gate, DirectionMixer, Echo, ChromaVerb, MultiMeter
3rd party plugins:
Fabfilter Pro L2, R2, Q4
SonicDigital Vela
2cAudio B2
Soundtoys Spaceblender
NativeInstruments Raum

Riding a zebra in a stairwell

Endless journeys aboard The Restless Train, driven by soaring leads and beautiful guitars — a train that doesn’t just whistle, but sings along the way.

Synth: U-he ZebraHZ

DAW Studio One 7 (40 Instances)

Plugins:
Replika XT
Raum
Neutron 3 (Compressor and Equalizer)
DearVR pro 2
Ozone 9
Youlean Loudness Meter 2

Artwork by https://www.craiyon.com/

Eylumar - The Restless Train (OSC#198)

This track was created for KVRs One-Synth-Challenge 198. All sounds are exclusively synthesized using the Spline synthesizer with little post-processing.

Hangar 47

Made for KVR OSC #125
FL Studio 20.0.5
13 instances of T-Force Alpha

DAW FX's:
3x Fruity parametric EQ 2
4x Maximus

Other FX's:
1x VST zOne Amplio 2
1x OrilRiver

Statistics:
Integrated loudness -14,7 LUFS
Max momentary loudness -9,1 LUFS
Max short-tem loudness -11,0 LUFS
Loudnes range 11,5 LU
True peak L -0.56db
True peak R -0.56db
DC offset L +0%
DC offset R +0%

Can't Stop Time (T-Force Alpha)

3lu5iv3 - 7859

OSC125

Psychorchestra

This is the track I made for the contest OSC no 125 by KVR. 
Rank : 7/25.

Image by Tracy Lundgren of Pixabay

Diaseïs - Sooner or Later (OSC #125)

This is my submission for KVRAudio's One Synth Challenge #125. I have used 11 instances of T-Force Alpha Plus 2 VST to create this track. FX used for the track composed mainly of built-in FX from the VST itself (except for the few 3rd party free VSTs). Details of the FX list given in the OSC thread in KVRAudio forum.

Celebration EP

Disco Damsel

Join the challenge by going here: https://shorturl.at/bhBFQ

Diaseïs - Sooner or Later (OSC #125)

Diaseïs

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