Award-winning composer & sound post-production specialist for film and television.
Original music, dialogue editing, sound design and re-recording mixing for productions in Spain and worldwide.
NEMESIS
Short film · Drama · 2025 · Directed by Zin Atas. Original score and complete sound post-production by Walder Martinez. BEST MUSIC — 7th Independent and Experimental Short Film Festival of Kerala. Multiple festival selections and awards.
SELECTED WORK
Three projects representing feature film, animation and Spanish independent cinema.
Award-winning animated series · Re-recording Mixer
Spanish short film · Original Music & Sound Post-production
Recently released online after its festival run
MORE SELECTED CREDITS
SEAPER POWERS: THE RESCUE · Animation · Sound Designer, Dialogue Editor, Sound Editor & Re-recording Mixer · WATCH TRAILER ↗
EL INQUILINO · Short film · Composer, Dialogue Editor, Sound Designer & Sound Mixer
PERROS DEL FIN DEL MUNDO · Documentary · Composer
FEATURE FILMS
OMISSION · Dialogue Editor, Sound Designer & Sound Mixer
CITY BOY · Dialogue Editor, Foley Artist, Sound Designer & Sound Mixer
WHAT I DO
Music and sound conceived as part of the storytelling — from the first idea to the final master.
ORIGINAL MUSIC
Bespoke scores, themes and sonic identities for film, television and audiovisual narratives.
SOUND POST-PRODUCTION
Dialogue editing, ADR, Foley, sound effects and sound design shaped around performance, rhythm and emotion.
RE-RECORDING MIXING
Stereo, 5.1 and immersive mixes prepared for festivals, broadcast and streaming delivery.
CLIENT FEEDBACK
“His expertise in sound design brought an incredible depth of texture, mood and tone… Walder is both a craftsman and an artist.”
ADAM PEDITTO · Filmmaker · USA · The Wind
“He has a unique vision that transforms any project into something extraordinary.”
FRAN BUENO · Filmmaker · Spain · Comienzo, El Inquilino & La Última
ABOUT
I work at the intersection of music and sound, helping filmmakers create stories that feel emotionally precise, immersive and complete.
Based in Spain, I collaborate with directors and production teams internationally — from the first creative conversations through final delivery.
WATCH & LISTEN
NEMESIS — Original Score Excerpt
Music composed by Walder Martinez · Short film directed by Zin Atas
English 
Spanish