diff --git a/glava/render.c b/glava/render.c
index e64b0c2..7389c47 100644
--- a/glava/render.c
+++ b/glava/render.c
@@ -131,7 +131,7 @@ struct gl_data {
     int fcounter, ucounter, kcounter;
     bool print_fps, avg_window, interpolate, force_geometry, force_raised,
         copy_desktop, smooth_pass, premultiply_alpha, check_fullscreen,
-        clickthrough;
+        clickthrough, mirror_input;
     void** t_data;
     size_t t_count;
     float gravity_step, target_spu, fr, ur, smooth_distance, smooth_ratio,
@@ -226,6 +226,7 @@ static GLuint shaderload(const char*             rpath,
         "#define _SMOOTH_FACTOR %.6f\n"
         "#define _USE_ALPHA %d\n"
         "#define _PREMULTIPLY_ALPHA %d\n"
+        "#define _CHANNELS %d\n"
         "#define USE_STDIN %d\n"
         "#if USE_STDIN == 1\n"
         "uniform %s STDIN;\n"
@@ -251,7 +252,7 @@ static GLuint shaderload(const char*             rpath,
     GLchar* buf = malloc((blen * sizeof(GLchar*)) + ext.p_len);
     int written = snprintf(buf, blen, header_fmt, (int) shader_version, (int) max_uniforms,
                            gl->smooth_pass ? 1 : 0, (double) gl->smooth_factor,
-                           1, gl->premultiply_alpha ? 1 : 0,
+                           1, gl->premultiply_alpha ? 1 : 0, gl->mirror_input ? 1 : 2,
                            gl->stdin_type != STDIN_TYPE_NONE, bind_types[gl->stdin_type].n,
                            bind_header);
     if (written < 0) {
@@ -850,6 +851,7 @@ struct renderer* rd_new(const char**    paths,        const char* entry,
         .sm_prog           = 0,
         .copy_desktop      = true,
         .premultiply_alpha = true,
+        .mirror_input      = false,
         .check_fullscreen  = false,
         .smooth_pass       = true,
         .fft_scale         = 10.2F,
@@ -970,7 +972,10 @@ struct renderer* rd_new(const char**    paths,        const char* entry,
         },
         {
             .name = "setmirror", .fmt = "b",
-            .handler = RHANDLER(name, args, { r->mirror_input = *(bool*) args[0]; })
+            .handler = RHANDLER(name, args, {
+                    r->mirror_input  = *(bool*) args[0];
+                    gl->mirror_input = *(bool*) args[0];
+                })
         },
         {
             .name = "setfullscreencheck", .fmt = "b",
@@ -2101,7 +2106,7 @@ bool rd_update(struct renderer* r, float* lb, float* rb, size_t bsz, bool modifi
         gl->ur = gl->ucounter / gl->tcounter; /* update rate (UPS)    */
         if (gl->print_fps) {                  /* print FPS            */
             #ifdef GLAVA_DEBUG
-            printf("FPS: %.2f, UPS: %.2f\n, time: %.2f",
+            printf("FPS: %.2f, UPS: %.2f, time: %.2f\n",
                    (double) gl->fr, (double) gl->ur, (double) gl->time);
             #else
             printf("FPS: %.2f, UPS: %.2f\n",
diff --git a/shaders/glava/bars.glsl b/shaders/glava/bars.glsl
index 1aaedae..980a1a2 100644
--- a/shaders/glava/bars.glsl
+++ b/shaders/glava/bars.glsl
@@ -1,3 +1,4 @@
+/* Note: to only render a single channel, see `setmirror` in `rc.glsl`. */
 
 /* Center line thickness (pixels) */
 #define C_LINE 1
@@ -24,8 +25,10 @@
 /* Whether to switch left/right audio buffers */
 #define INVERT 0
 /* Whether to flip the output vertically */
-#define FLIP 0
+#define FLIP 1
 /* Whether to mirror output along `Y = X`, causing output to render on the left side of the window */
 /* Use with `FLIP 1` to render on the right side */
 #define MIRROR_YX 0
+/* Whether to disable mono rendering when `#request setmirror true` is set in `rc.glsl`. */
+#define DISABLE_MONO 0
 
diff --git a/shaders/glava/bars/1.frag b/shaders/glava/bars/1.frag
index c238635..51b5cfb 100644
--- a/shaders/glava/bars/1.frag
+++ b/shaders/glava/bars/1.frag
@@ -29,6 +29,10 @@ out vec4 fragment;
 #define TWOPI 6.28318530718
 #define PI 3.14159265359
 
+#if DISABLE_MONO == 1
+#define CHANNELS 2
+#endif
+
 void main() {
 
     #if MIRROR_YX == 0
@@ -42,8 +46,16 @@ void main() {
     #define AREA_X gl_FragCoord.y
     #define AREA_Y gl_FragCoord.x
     #endif
-    
+
+    #if CHANNELS == 2
     float dx = (AREA_X - (AREA_WIDTH / 2));
+    #else
+    #if INVERT == 1
+    float dx = AREA_WIDTH - AREA_X;
+    #else
+    float dx = AREA_X;
+    #endif
+    #endif
     #if FLIP == 0
     float d = AREA_Y;
     #else
@@ -57,8 +69,13 @@ void main() {
     float p, s;
     if (md < ceil(float(BAR_WIDTH) / 2) && md >= -floor(float(BAR_WIDTH) / 2)) {  /* if not in gap */
         s = dx / section;
-        p = (sign(s) == 1.0 ? ceil(s) : floor(s)) / float(nbars / 2); /* position, (-1.0F, 1.0F))     */
-        p += sign(p) * ((0.5F + center) / AREA_WIDTH);    /* index center of bar position */
+        p = (sign(s) == 1.0 ? ceil(s) : floor(s));
+        #if CHANNELS == 2
+        p /= float(nbars / 2);
+        #else
+        p /= float(nbars);
+        #endif
+        p += sign(p) * ((0.5F + center) / AREA_WIDTH);                /* index center of bar position */
         /* Apply smooth function and index texture */
         #define smooth_f(tex, p) smooth_audio(tex, audio_sz, p)
         float v;
@@ -72,7 +89,9 @@ void main() {
             #if DIRECTION == 1
             p = 1.0F - p;
             #endif
-            #if INVERT > 0
+            #if CHANNELS == 1
+            v = smooth_f(audio_l, p);
+            #elif INVERT > 0 
             v = smooth_f(audio_l, p);
             #else
             v = smooth_f(audio_r, p);
@@ -82,7 +101,9 @@ void main() {
             #if DIRECTION == 1
             p = 1.0F - p;
             #endif
-            #if INVERT > 0
+            #if CHANNELS == 1
+            v = smooth_f(audio_l, p);
+            #elif INVERT > 0
             v = smooth_f(audio_r, p);
             #else
             v = smooth_f(audio_l, p);
diff --git a/shaders/glava/rc.glsl b/shaders/glava/rc.glsl
index 422d36f..6394ec6 100644
--- a/shaders/glava/rc.glsl
+++ b/shaders/glava/rc.glsl
@@ -36,7 +36,8 @@
    "none"   - Disable window opacity completely. */
 #request setopacity "native"
 
-/* Whether to mirror left and right audio input channels from PulseAudio.*/
+/* Whether to average and mirror left and right audio input channels.
+   This may cause some modules to only render a single channel. */
 #request setmirror false
 
 /* OpenGL context and GLSL shader versions, do not change unless