Soundfont To Dwp

Once every zone is mapped, every loop is set, and every envelope matches the original SF2, click "Build Instrument".

Depending on the DWP implementation:

When converting Soundfont to DWP, you will encounter three major headaches.

import os, csv, subprocess
from midiutil import MIDIFile  # optional, for test MIDI
def sf2_to_dwp(sf2_path, output_dir):
# Step 1: Export using polyphone CLI
os.system(f"polyphone-cli -e sf2_path -o output_dir/samples") soundfont to dwp
# Step 2: Build ADPCM and DWP def
with open(f"output_dir/bank.def", "w") as def_file:
    def_file.write("#include <kos_dwp.h>\n\n")
for sample in os.listdir(f"output_dir/samples"):
        if sample.endswith(".wav"):
            wav_path = f"output_dir/samples/sample"
            adpcm_path = wav_path.replace(".wav", ".adpcm")
            subprocess.run(["wav2adpcm", wav_path, adpcm_path])
name = sample.replace(".wav", "")
            def_file.write(f'sample name "adpcm_path";\n')
def_file.write("\nbank 0 \n")
    def_file.write('  preset 0 "ConvertedBank" instrument DummyInst;\n')
    def_file.write("\n")
subprocess.run(["dwpcc", f"output_dir/bank.def", "-o", f"output_dir/bank.dwp"])
print(f"Done: output_dir/bank.dwp")

Direct SoundFont to DWP conversion is not supported by any mainstream or known tool.
If you must perform this conversion, you will need:

Recommendation: Before proceeding, verify if your target system truly requires DWP or if an alternative format (e.g., SFZ, WAV banks, or raw PCM + map) would work. Once every zone is mapped, every loop is

The standard tool for this task is the Dream Sound Font Tools (often referred to as Dream SDK or Dream Blend). This is proprietary software provided by Dream SAS (formerly Dream S.A.S.) for developers.

Here is the general workflow for converting a file:

The ability to convert SF2 to DWP bridges the gap between the vast world of PC sampling and the tactile, low-latency world of DSP hardware. While the process requires a understanding of synthesis limits—specifically regarding RAM and sample rates—the result is highly rewarding.

By converting SoundFonts, you are breathing new life into the Dream chipset, allowing it to sound however you want it to, rather than being limited to the stock General MIDI ROM. Depending on the DWP implementation:

For specific tools and SDK downloads, developers should refer to the official Dream SAS technical documentation or the support communities surrounding the Dream Blaster product line.

dwp.build("Vintage_Rhodes.dwp")

Note: As of 2025, no public script exists for this because DropWord’s SDK is closed. You must use the GUI Workshop method or commission a developer to use the private API.