SD2 to SMP Converter

Online tool to convert SD2 audio into SMP

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No Installation

The SD2 to SMP converter runs entirely in your web browser. No plugins, no downloads, no setup — just open and go.

Bulk Conversion

Convert an entire folder of SD2 recordings to SMP at once. Just upload all files and let the batch converter handle the rest.

Quality Preserved

The SD2 to SMP conversion maintains maximum audio fidelity. Your recordings come through clean, without unnecessary artifacts.

How to convert SD2 to SMP

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose smp or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your smp file right afterwards

About formats

Sound Designer II (SD2) is a professional audio format created by Digidesign around 1988 as the successor to the original Sound Designer format. For over a decade, SD2 was the standard interchange format in professional recording studios, especially those on Macintosh systems. It stores uncompressed linear PCM audio at up to 24-bit resolution with sample rates used in professional production (44.1, 48, 88.2, and 96 kHz). A distinctive technical trait is its reliance on the classic Mac OS resource fork for critical metadata — sample rate, bit depth, and channel configuration — while audio data resides in the data fork. This design worked elegantly within the Mac ecosystem but created portability challenges when files moved to Windows or Unix. A key advantage was SD2's support for multiple channels in a single file and tight integration with the Pro Tools editing environment, enabling non-destructive region-based editing. The format also carried loop points and markers, making it valuable for sample libraries. As Avid Technology shifted Pro Tools toward WAV and AIFF, SD2 usage declined, but millions of legacy session archives still contain SD2 files needing occasional conversion.
Initial release: 1988
SMP is the native file format of SampleVision, a sample editing application developed by Turtle Beach Systems around 1990. SampleVision was among the first PC-based visual sample editors, letting musicians view waveforms on screen and perform cut, copy, paste, and loop-point editing — capabilities previously limited to expensive dedicated hardware samplers. The SMP format stores 16-bit mono PCM audio along with sampling-specific metadata: loop start and end points, sustain loops, release loops, and MIDI root note assignments. This made SMP files directly useful for creating and exchanging patches between hardware samplers via MIDI Sample Dump Standard (SDS) transfers, which SampleVision automated through its interface. A primary advantage was bridging the PC world with professional sampling hardware from Akai, E-mu, Ensoniq, and Roland — devices that had tiny screens and minimal editing tools. The format also supported common sample rates (22050, 44100 Hz) and brief text descriptions alongside audio data. Though Turtle Beach pivoted to gaming peripherals and SampleVision was discontinued, SMP files persist in vintage sample library archives and can be converted using SoX.
Initial release: 1990

Frequently Asked Questions

Why convert SD2 to SMP?

SD2 is a professional niche format rarely supported outside Avid products. Converting to SMP makes sharing effortless.

What opens SMP audio?

SMP can be opened with SampleVision, SoX, legacy sampler editors. Most modern audio applications handle this format without issues.

Will I lose audio quality in the conversion?

Quality depends on the codec. If SMP uses lossy encoding, minor data loss occurs. Lossless targets preserve the original SD2 audio faithfully.

How many SD2 files can I convert in one go?

Upload as many SD2 files as you need and convert them to SMP simultaneously. The batch feature handles multiple files efficiently.

Is the SD2 to SMP conversion secure?

Completely. Your SD2 files are erased immediately after processing, and converted SMP results are purged from our servers within 24 hours.

Does the converter work on mobile devices?

Yes. The SD2 to SMP converter runs entirely in a web browser, so it works on smartphones, tablets, laptops, and desktops alike.