Audio Mixing — 6 Hold Queue Files for Nonprofit Phone System (20 Ads + Background Music)

We're a nonprofit marketing communications team looking for an experienced audio editor to mix six combined hold queue audio files for a phone system rollout. The voice-over recordings are professionally recorded, cleaned, and normalized — your role is sequencing and music integration, not voice editing. This is a discrete, well-scoped project with clear deliverables. Ideal for editors experienced with IVR, phone system audio, podcast production, or commercial ad mixing. Scope: Take 20 individual voice-over ad files (approximately 12-18 seconds each) and mix them into 6 combined rotation files, one per call queue. Each combined file contains 5 sequenced ads with royalty-free background music underneath the voice throughout. Source materials provided: 20 individual voice-over ad files (WAV, cleaned and normalized) 1 royalty-free licensed music track (Artlist license, provided at kickoff) Sequencing specification for each combined file Deliverables — 6 combined MP3 files: HoldQueue_ECI.mp3 (5 ads) HoldQueue_PTC.mp3 (5 ads) HoldQueue_Preschool.mp3 (5 ads) HoldQueue_SESS.mp3 (5 ads) HoldQueue_PIT.mp3 (5 ads) HoldQueue_MainOperator.mp3 (5 ads) Per-file editing requirements: Sequence the assigned ads in the specified order Add light transitions between ads (fade in/out or brief pause — your judgment) Overlay background music throughout at approximately -18 dB below voice track Use the same music track across all 6 files for consistency Normalize output levels across all 6 files Ensure voice remains clearly intelligible over the music bed Technical specifications: -Output format: MP3 -Maximum file size: Under 5 MB per file -Sample rate: 44.1 kHz or 48 kHz -Bit rate: 128 kbps or 192 kbps -Channels: Stereo -Target combined file length per queue: approximately 80-95 seconds Timeline: -We're targeting kickoff within the next week and final delivery within 5-7 business days after receipt of source materials and music track. If your calendar can accommodate a faster turnaround, please note that in your proposal. Revisions: -Please include one round of revisions per file in your quote for minor adjustments after initial delivery. What we're looking for in candidates: -Portfolio samples of prior IVR, phone system audio, podcast production, or commercial ad mixing (please include links) -Experience mixing voice and music beds together (with voice remaining clearly intelligible) -Fast, clear communication (we're a nonprofit with a tight timeline — responsiveness matters) -Ability to start this week. How to apply: Please include in your proposal: Portfolio samples — 1-2 relevant examples of similar work (IVR, hold music, podcast, or commercial audio mixing) Estimated hours for the full scope (low and high range) Total quote based on your hourly rate and estimated hours Availability — when could you start, and what's your realistic delivery timeline? One clarifying question — anything you'd want to know before starting Serious inquiries only, please. We'll be selecting within 1-2 business days of posting.