diff --git a/CMakeLists.txt b/CMakeLists.txt
index ff93914..d35e02a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -57,8 +57,8 @@ add_library(sonobulus_core STATIC
     src/synth/Synth.cpp
     src/synth/Voice.cpp
     src/synth/Filter.cpp
-    src/synth/Instruments/Instrument.cpp
-    src/synth/Instruments/PianoString.cpp
+    src/synth/instruments/Instrument.cpp
+    src/synth/instruments/PianoString.cpp
 )
 
 if (WIN32)
diff --git a/config/sonobulus.cfg b/config/sonobulus.cfg
index 1fe0fdf..ea523a9 100644
--- a/config/sonobulus.cfg
+++ b/config/sonobulus.cfg
@@ -29,7 +29,9 @@ AudioEngine = (
         BufferSize = 512;
         PitchStandard = 440.0;
         MidiHome = 69;
-        NotesPerOctave = 12;
+        NotesPerOctave = 12.0;
+        OctaveConstant = 2.0;
+        MaxVoices = 32;
     }
 );
 
diff --git a/src/LoggerService.cpp b/src/LoggerService.cpp
index b8e140b..1106824 100644
--- a/src/LoggerService.cpp
+++ b/src/LoggerService.cpp
@@ -14,7 +14,7 @@ namespace fs = std::filesystem;
 LoggerService::LoggerService(ConfigService* config, const std::string& loggerId) {
 
     if(!(config->getConfig<LoggerParams, LoggerConfig>("Logger", loggerId, &configuration_))) {
-        std::cout << "Failed to get logger configuration fom config service" << std::endl;
+        std::cout << "Failed to get logger configuration from config service" << std::endl;
         return;
     }
     
diff --git a/src/config/AudioConfig.hpp b/src/config/AudioConfig.hpp
index 13d59e5..7d4627f 100644
--- a/src/config/AudioConfig.hpp
+++ b/src/config/AudioConfig.hpp
@@ -1,18 +1,19 @@
 
-
-
 #pragma once
 
 #include "IConfig.hpp"
 
 struct AudioParams : IParams {
+    std::string id;
     uint32_t sampleRate;
     uint32_t channels;
     uint32_t stereoMode;
     uint32_t bufferSize;
     float pitchStandard;
     int32_t midiHome;
-    int32_t notesPerOctave;
+    float notesPerOctave;
+    float octaveConstant;
+    size_t maxVoices;
 };
 
 
@@ -31,9 +32,12 @@ public:
         setting.lookupValue("SampleRate", params_->sampleRate);
         setting.lookupValue("StereoMode", params_->stereoMode);
         setting.lookupValue("BufferSize", params_->bufferSize);
+        setting.lookupValue("Channels", params_->channels);
         setting.lookupValue("PitchStandard", params_->pitchStandard);
         setting.lookupValue("MidiHome", params_->midiHome);
         setting.lookupValue("NotesPerOctave", params_->notesPerOctave);
+        setting.lookupValue("OctaveConstant", params_->octaveConstant);
+        setting.lookupValue("MaxVoices", params_->maxVoices);
 
         return true;
     }
diff --git a/src/synth/AudioEngine.cpp b/src/synth/AudioEngine.cpp
index 512ff85..01a2423 100644
--- a/src/synth/AudioEngine.cpp
+++ b/src/synth/AudioEngine.cpp
@@ -8,6 +8,12 @@
 
 AudioEngine::AudioEngine(ConfigService* config, LoggerService* logger, Synth* synth) : config_(config), logger_(logger), synth_(synth) {
 
+    // load audio settings from config service
+    if(!(config->getConfig<AudioParams, AudioConfig>("AudioEngine", "Main", &configuration_))) {
+        logger_->log("Audio", LogFlag::Error, "Failed to get logger configuration from config service");
+        return;
+    }
+
     if(audioDevice_.getDeviceCount() < 1) {
         logger_->log("Audio", LogFlag::Error, "No audio devices found.");
     }
@@ -22,17 +28,26 @@ bool AudioEngine::start() {
     // initialize the audio engine
     RtAudio::StreamParameters params;
     params.deviceId = audioDevice_.getDefaultOutputDevice();
-    params.nChannels = channels_; // we're doing two duplicate channels for pseudo-mono
+    params.nChannels = configuration_.channels; // we're doing two duplicate channels for pseudo-mono
     params.firstChannel = 0;
 
     RtAudio::StreamOptions options;
     options.flags = RTAUDIO_MINIMIZE_LATENCY;
 
-    RtAudioErrorType status = audioDevice_.openStream(&params, nullptr, RTAUDIO_FLOAT32, sampleRate_, &bufferFrames_, &AudioEngine::audioCallback, this, &options);
+    RtAudioErrorType status = audioDevice_.openStream(
+        &params, 
+        nullptr, 
+        RTAUDIO_FLOAT32, 
+        configuration_.sampleRate, 
+        &configuration_.bufferSize, 
+        &AudioEngine::audioCallback, 
+        this, 
+        &options
+    );
     if(status != RTAUDIO_NO_ERROR) {
         logger_->log("Audio", LogFlag::Error, "Error opening RtAudio stream.");
         return false;
-    } 
+    }
     
     status = audioDevice_.startStream();
     if(status != RTAUDIO_NO_ERROR) {
@@ -41,7 +56,7 @@ bool AudioEngine::start() {
     } 
 
     // sanity check
-    std::string msg = "sample rate: " + std::to_string(sampleRate_) + ", buffer frames: " + std::to_string(bufferFrames_);
+    std::string msg = "sample rate: " + std::to_string(configuration_.sampleRate) + ", buffer frames: " + std::to_string(configuration_.bufferSize);
     logger_->log("AudioEngine", LogFlag::Info, msg);
     return true;
 
diff --git a/src/synth/AudioEngine.hpp b/src/synth/AudioEngine.hpp
index dcb7b50..167c637 100644
--- a/src/synth/AudioEngine.hpp
+++ b/src/synth/AudioEngine.hpp
@@ -7,6 +7,7 @@
 
 #include "LoggerService.hpp"
 #include "config/ConfigService.hpp"
+#include "config/AudioConfig.hpp"
 #include "Synth.hpp"
 #include "NoteQueue.hpp"
 
@@ -35,13 +36,10 @@ private:
 
     RtAudio audioDevice_ { AUDIO_API };
 
-    // TODO: make these configurable
-    uint32_t sampleRate_ = 44100;
-    uint32_t bufferFrames_ = 512;
-    uint32_t channels_ = 2;
-
     LoggerService* logger_;
     ConfigService* config_;
+    AudioParams configuration_;
+
     Synth* synth_;
 
 };
diff --git a/src/synth/Instruments/Instrument.cpp b/src/synth/Instruments/Instrument.cpp
index d8b7cb4..c5462f4 100644
--- a/src/synth/Instruments/Instrument.cpp
+++ b/src/synth/Instruments/Instrument.cpp
@@ -3,8 +3,8 @@
 
 #include "string"
 
-Instrument::Instrument(ConfigService* config, LoggerService* logger) :
-    config_(config), logger_(logger) {
+Instrument::Instrument(ConfigService* config, LoggerService* logger, float sampleRate) :
+    config_(config), logger_(logger), sampleRate_(sampleRate) {
 
 }
 
diff --git a/src/synth/Instruments/Instrument.hpp b/src/synth/Instruments/Instrument.hpp
index dc8b523..5b509cb 100644
--- a/src/synth/Instruments/Instrument.hpp
+++ b/src/synth/Instruments/Instrument.hpp
@@ -5,13 +5,13 @@
 #include "LoggerService.hpp"
 
 // an instrument is our state space model. it calculates discrete samples as a function of time, the current states, and the inputs
-// an instrumeent is owned by a voice
+// an instrument is owned by a voice
 class Instrument {
 
 public:
 
     Instrument() = default;
-    Instrument(ConfigService* config, LoggerService* logger);
+    Instrument(ConfigService* config, LoggerService* logger, float sampleRate);
     ~Instrument() = default;
 
     virtual void noteOn(float frequency, float velocity);
@@ -23,7 +23,7 @@ public:
 
 protected: 
 
-    float sampleRate_ = 44100.0f;
+    float sampleRate_ = 1.0f;
     bool active_ = false;
 
     ConfigService* config_;
diff --git a/src/synth/Instruments/PianoString.cpp b/src/synth/Instruments/PianoString.cpp
index e192eef..b5fd7b5 100644
--- a/src/synth/Instruments/PianoString.cpp
+++ b/src/synth/Instruments/PianoString.cpp
@@ -1,7 +1,7 @@
 
 #include "PianoString.hpp"
 
-PianoString::PianoString(ConfigService* config, LoggerService* logger) : Instrument(config, logger) {
+PianoString::PianoString(ConfigService* config, LoggerService* logger, float sampleRate) : Instrument(config, logger, sampleRate) {
 
     stringY_current_.resize(segmentCount_ + 1);
     stringY_previous_.resize(segmentCount_ + 1);
diff --git a/src/synth/Instruments/PianoString.hpp b/src/synth/Instruments/PianoString.hpp
index d2d1fc6..2ea3ecc 100644
--- a/src/synth/Instruments/PianoString.hpp
+++ b/src/synth/Instruments/PianoString.hpp
@@ -3,14 +3,14 @@
 
 #include <cmath>
 
-#include "synth/Instruments/Instrument.hpp"
+#include "synth/instruments/Instrument.hpp"
 
 class PianoString : public Instrument {
 
 public:
 
     PianoString() = default;
-    PianoString(ConfigService* config, LoggerService* logger);
+    PianoString(ConfigService* config, LoggerService* logger, float sampleRate);
     ~PianoString() = default;
     
     void noteOn(float frequency, float velocity) override;
diff --git a/src/synth/KeyboardController.cpp b/src/synth/KeyboardController.cpp
index b4d20fe..41c7361 100644
--- a/src/synth/KeyboardController.cpp
+++ b/src/synth/KeyboardController.cpp
@@ -13,7 +13,7 @@ KeyboardController::KeyboardController(ConfigService* config, LoggerService* log
 
     // load keymap from config service
     if(!(config->getConfig<KeymapParams, KeymapConfig>("KeyboardController", "Main", &configuration_))) {
-        logger_->log("Keyboard", LogFlag::Error, "Failed to get logger configuration fom config service");
+        logger_->log("Keyboard", LogFlag::Error, "Failed to get logger configuration from config service");
         return;
     }
 
diff --git a/src/synth/Scope.cpp b/src/synth/Scope.cpp
index 28b2d05..c645dbc 100644
--- a/src/synth/Scope.cpp
+++ b/src/synth/Scope.cpp
@@ -4,7 +4,7 @@
 #include <iostream>
 
 ScopeBuffer::ScopeBuffer(QObject *parent) : QObject(parent) {
-
+    // timer is set in qml
 }
 
 ScopeBuffer::ScopeBuffer(ConfigService* config, LoggerService* logger, size_t size) :
@@ -45,7 +45,7 @@ void Scope::paint(QPainter *painter) {
 
     if(scopeBuffer_ != nullptr) scopeBuffer_->read(buffer_);
 
-    // TODO: scale to max amplitude ?
+    // TODO: scale to max amplitude ? probably make it configurable if you want to make scope options
     float maxAmp = 1.0f;
     /*
     for(float s : buffer_) {
diff --git a/src/synth/Synth.cpp b/src/synth/Synth.cpp
index 268289c..7a50325 100644
--- a/src/synth/Synth.cpp
+++ b/src/synth/Synth.cpp
@@ -4,9 +4,17 @@
 Synth::Synth(ConfigService* config, LoggerService* logger, ScopeBuffer* scope, NoteQueue* queue) :
     config_(config), logger_(logger), scope_(scope), noteQueue_(queue) {
 
-    voices_.fill(Voice(config_, logger_));
+    // load audio settings from config service
+    if(!(config->getConfig<AudioParams, AudioConfig>("AudioEngine", "Main", &engineConfiguration_))) {
+        logger_->log("Audio", LogFlag::Error, "Failed to get logger configuration from config service");
+        return;
+    }
+    // note: this is the audio engine's configuration so we can grab sample rate
+    // it includes some synth params as well, so when synth gets its own config node they all need to be moved
+    
+    voices_.assign(engineConfiguration_.maxVoices, Voice(config_, logger_, static_cast<float>(engineConfiguration_.sampleRate), &engineConfiguration_));
 
-    filter_.setSampleRate(44100.0f);
+    filter_.setSampleRate(engineConfiguration_.sampleRate);
     filter_.setParams(Filter::Type::BiquadLowpass, 4000.0f, 0.707f);
 
 }
diff --git a/src/synth/Synth.hpp b/src/synth/Synth.hpp
index 9f0858d..02b0493 100644
--- a/src/synth/Synth.hpp
+++ b/src/synth/Synth.hpp
@@ -2,6 +2,7 @@
 #pragma once
 
 #include "config/ConfigService.hpp"
+#include "config/AudioConfig.hpp"
 #include "LoggerService.hpp"
 #include "NoteQueue.hpp"
 #include "Voice.hpp"
@@ -29,10 +30,11 @@ private:
     Filter filter_;
 
     // voices
-    static constexpr size_t MAX_VOICES = 32;
-    std::array<Voice, MAX_VOICES> voices_;
+    size_t maxVoices;
+    std::vector<Voice> voices_;
 
     ConfigService* config_;
+    AudioParams engineConfiguration_;
     LoggerService* logger_;
     ScopeBuffer* scope_;;
     NoteQueue* noteQueue_;
diff --git a/src/synth/Voice.cpp b/src/synth/Voice.cpp
index 6b87ead..b81e78a 100644
--- a/src/synth/Voice.cpp
+++ b/src/synth/Voice.cpp
@@ -1,11 +1,11 @@
 
 #include "Voice.hpp"
 
-Voice::Voice(ConfigService* config, LoggerService* logger) :
-    config_(config), logger_(logger) {
+Voice::Voice(ConfigService* config, LoggerService* logger, float sampleRate, AudioParams* params) :
+    config_(config), logger_(logger), sampleRate_(sampleRate), params_(params) {
 
-    // TODO: instrument factory
-    instrument_ = PianoString(config_, logger_);
+    // TODO: instrument factory << WHAT DO YOU MEAN JUST TODO A WHOLE FACTORY
+    instrument_ = PianoString(config_, logger_, sampleRate_);
 
 }
 
diff --git a/src/synth/Voice.hpp b/src/synth/Voice.hpp
index 1c2e839..7e8d476 100644
--- a/src/synth/Voice.hpp
+++ b/src/synth/Voice.hpp
@@ -3,8 +3,9 @@
 
 #include <stdint.h>
 
-#include "Instruments/Instrument.hpp"
-#include "Instruments/PianoString.hpp"
+#include "instruments/Instrument.hpp"
+#include "instruments/PianoString.hpp"
+#include "config/AudioConfig.hpp"
 
 // a voice is a tone generator that the synth uses for polyphony
 // the synth mixes multiple voices together into a polyphonic audio. calculations for samples are handled in the instrument
@@ -13,7 +14,7 @@ class Voice {
 public:
 
     Voice() = default;
-    Voice(ConfigService* config, LoggerService* logger);
+    Voice(ConfigService* config, LoggerService* logger, float sampleRate, AudioParams* params);
     ~Voice() = default;
 
     void noteOn(uint8_t midiNote, float velocity);
@@ -26,17 +27,17 @@ public:
 
 private:
 
-    float sampleRate_ = 44100.0f;
-
     inline float noteToFrequency(uint8_t note) {
-        return 440.0f * pow(2.0f, static_cast<float>(note - 69) / static_cast<float>(12)); 
+        return params_->pitchStandard * pow(params_->octaveConstant, static_cast<float>(note - params_->midiHome) / params_->notesPerOctave); 
     }
     
+    float sampleRate_ = 1.0f;
     uint8_t note_ = 0;
     float velocity_ = 1.0f;
     bool active_ = false;
 
     ConfigService* config_;
+    AudioParams* params_;
     LoggerService* logger_;
     PianoString instrument_;